Purchase and Sale.

Select 40 Fund. Select 40 Fund hereby agrees to sell to the Buyer, and the Buyer hereby agrees to purchase from Select 40 Fund, all right, title and interest of Select 40 Fund in and to the Select 40 Fund Units, free and clear of all liens, claims, restrictions and other encumbrances other than those arising under the Partnership Agreement. At the Closing (as defined herein), Select 40 Fund and the Buyer shall execute and deliver an Assignment and Assumption of Class A Preferred Units in the form attached hereto as Exhibit A (an “Assignment and Assumption Agreement”).

Income Fund. Income Fund hereby agrees to sell to the Buyer, and the Buyer hereby agrees to purchase from Income Fund, all right, title and interest of Income Fund in and to the Income Fund Units, free and clear of all liens, claims, restrictions and other encumbrances other than those arising under the Partnership Agreement. At the Closing, Income Fund and the Buyer shall execute and deliver an Assignment and Assumption Agreement.

Purchase Price.

The consideration to be paid to the Sellers by the Buyer for the Purchased Interest is an amount equal to Twenty Dollars ($20.00) per Class A Unit plus an amount equal to the sum of (x) the Cumulative Class A Preferred Unit Arrearage, if any, with respect to the Purchased Interest as of the Closing Date (as defined herein), plus (y) the Current Distributions on the Purchased Interests as of the Closing Date (the “Purchase Price”).

The Parties hereby agree that there is no Cumulative Class A Preferred Unit Arrearage and the respective aggregate Current Distributions as of the Closing Date (assuming a Closing Date of December 21, 2020) are $559,251.61 in the aggregate, subject to state withholding tax of $73,475.00 for the Select 40 Fund Units and $419,354.84 in the aggregate, subject to state withholding tax of $55,125.00 for the Income Fund Units.

Upon the terms and subject to the conditions set forth in this Agreement, the Buyer shall pay the Purchase Price to the Sellers at the Closing in cash or by wire transfer(s) of immediately available funds to such account(s) as have previously been identified to the Buyer by each of the Sellers in writing.

Closing.

Closing Date. The closing of the transactions contemplated by this Agreement (the “Closing”) shall take place on the business day immediately preceding the scheduled closing date of the Business Combination Transaction under the Business Combination Agreement (the “Closing Date”), at 9:00 a.m. central time, at the offices of Hunton Andrews Kurth LLP, 600 Travis Street, Suite 4200, Houston, Texas 77002 or remotely by exchange of documents and signatures (or their electronic counterparts). It is anticipated that the Closing Date will be December 21, 2020.

Deliverables. At the Closing,

Each of the Sellers, severally and not jointly, shall:

deliver to the Buyer a counterpart duly executed by such Seller of an Assignment and Assumption Agreement; and

deliver, or cause to be delivered, to the Buyer a duly executed Resignation (as defined herein).

The Buyer shall:

deliver to each of the Sellers a counterpart duly executed by Buyer of an Assignment and Assumption Agreement; and

make payment of the Purchase Price for the Purchased Interest to the Sellers by wire transfer as specified in Section 2.

Representations and Warranties of the Sellers. Each of the Sellers hereby, severally and not jointly, represents and warrants to the Buyer on the date hereof and on the Closing Date that:

it is duly organized, validly existing and in good standing under the laws of the jurisdiction of its organization, and has full power and authority to enter into this Agreement and consummate the transactions contemplated hereby;

this Agreement has been duly executed and delivered by it and constitutes its legal, valid and binding agreement, enforceable against it in accordance with its terms, except as enforceability hereof may be limited by bankruptcy, insolvency, moratorium, and other similar laws relating to creditors’ rights generally and by general equitable principles;

it is the lawful owner, beneficially and of record, of its portion of the Purchased Interest, and upon consummation of the sale and delivery of such portion of the Purchased Interest hereunder, the relevant Class A Units shall be free and clear of all liens, claims, restrictions and other encumbrances, other than those arising under the Partnership Agreement;

it has full legal right, power and authority to sell and deliver its portion of the Purchased Interest to the Buyer pursuant to this Agreement;

the sale of its portion of the Purchased Interest to the Buyer pursuant to this Agreement is made in accordance with all applicable laws and regulations and does not breach or violate any contract or agreement to which it is a party or by which it or its portion of the Purchased Interest is bound;

it has not sold or transferred its portion of the Purchased Interest, any portion thereof or any interest therein to any other person, and no other person has any right or option to acquire its portion of the Purchased Interest, or any portion thereof or any interest therein;

neither it nor any of its affiliates, nor any of their respective officers, directors or employees has employed any broker or finder or incurred any liability for any brokerage fees, commissions, or finder’s fees in connection with the transactions contemplated by this Agreement except for the brokers who are compensated in accordance with the terms of the Business Combination Transaction; and

it acknowledges that it is a sophisticated seller with respect to the purchase, sale and valuation of securities such as the Purchased Interest. Additionally, it acknowledges that it has adequate information concerning the Purchased Interest and the business and financial condition of the Partnership and its affiliates to make an informed decision regarding the sale of the Purchased Interest, and has independently and without reliance upon the Partnership, and based upon such information as it has deemed appropriate, made its own analysis and decision to sell the Purchased Interest.

Representations and Warranties of the Buyer. The Buyer hereby represents and warrants to each of the Sellers on the date hereof and on the Closing Date that:

it is a limited liability company, duly formed, validly existing and in good standing under the laws of the State of Delaware, and has full power and authority to enter into this Agreement and consummate the transactions contemplated hereby;

this Agreement has been duly executed and delivered by it and constitutes its legal, valid and binding agreement, enforceable against it in accordance with its terms, except as enforceability hereof may be limited by bankruptcy, insolvency, moratorium, and other similar laws relating to creditors’ rights generally and by general equitable principles;

the purchase of the Purchased Interest by the Buyer pursuant to this Agreement is made in accordance with all applicable laws and regulations and as of the Closing Date will not breach or violate any contract or agreement to which the Buyer is a party or by which the Buyer or its assets are bound; and

neither it nor any of its affiliates, nor any of their respective officers, directors or employees has employed any broker or finder or incurred any liability for any brokerage fees, commissions, or finder’s fees in connection with the transactions contemplated by this Agreement.

Survival. The representations, warranties, covenants and agreements of the Parties contained in this Agreement will survive the Closing for a period equal to the applicable statute of limitations.

Conditions to Closing.

Conditions to Obligations of the Buyer. The obligations of the Buyer to consummate the transactions contemplated by this Agreement shall be subject to the fulfillment or the Buyer’s waiver, at or prior to the Closing, of each of the following conditions:

The representations and warranties of each of the Sellers contained in Section 4 shall be true and correct on and as of the Closing Date.

Each of the Sellers shall have performed in all material respects its obligations, covenants, and agreements contained herein and required to be performed prior to the Closing.

Each of the Sellers shall have delivered, or be ready, willing, and able to deliver, the items required to be delivered by each of the Sellers pursuant to Section 3(b)(i) and Section 8(b).

Conditions to Obligations of the Sellers. The obligations of the Sellers to consummate the transactions contemplated by this Agreement shall be subject to the fulfillment or each of the Seller’s waiver, at or prior to the Closing, of each of the following conditions:

The representations and warranties of the Buyer contained in Section 5 shall be true and correct on and as of the Closing Date.

The Buyer shall have performed in all material respects its obligations, covenants, and agreements contained herein and required to be performed prior to the Closing.

The Buyer shall have delivered to the Sellers cash in an amount equal to the Purchase Price by wire transfer in immediately available funds, to an account or accounts designated in writing by the Sellers to the Buyer.

The Buyer shall have delivered, or be ready, willing, and able to deliver, the other items required to be delivered by the Buyer pursuant to Section 3(b)(ii).

Covenants.

Further Assurances. Following the Closing, each of the Parties hereto shall, and shall cause their respective affiliates to, execute and deliver such additional documents, instruments, conveyances and assurances and take such further actions as may be reasonably required to carry out the provisions hereof and give effect to the transactions contemplated by this Agreement.

Resignation. The Sellers shall deliver to the Buyer on the Closing Date a written resignation, effective as of the Closing Date, of Mr. Bob Coble from the Board of Directors of the General Partner (the “Resignation”).

True-Up. It is understood and agreed that on a quarterly basis, the Partnership makes required estimated tax withholding payments to states in which the Partnership operates, which payments are made on behalf of its partners (including the Sellers). Such withholding payments are made at pre-established amounts. The actual amount of tax owed by each Seller for the period from January 1, 2020

Indemnification.

Indemnification by the Sellers. From and after the Closing Date, subject to the other provisions of this Section 9, the Sellers shall, severally and not jointly, indemnify and hold the Buyer harmless from and against any and all damages, losses, deficiencies, costs, expenses, obligations, fines, expenditures, claims and liabilities, including court costs and reasonable attorneys’, accountants’ and other experts’ fees and reasonable expenses of investigation, defending and prosecuting threatened claims, fines, actions, suits, litigation, demands, investigations or proceedings or any arbitration or binding dispute resolution proceeding (“Damages”) suffered by the Buyer as a result of, caused by, arising out of, or in any way relating to:

any inaccuracy in or breach of any of the representations or warranties of such Seller contained in this Agreement or in any instrument delivered by or on behalf of such Seller pursuant to this Agreement, as of the date such representation or warranty was made; or

any breach or non-fulfillment of any covenant, agreement or obligation to be performed by such Seller pursuant to this Agreement.

Indemnification By the Buyer. From and after the Closing Date, subject to the other provisions of this Section 9, the Buyer shall indemnify and hold each of the Sellers harmless from and against any and all Damages suffered by the Seller Indemnitees as a result of, caused by, arising out of, or in any way relating to:

any inaccuracy in or breach of any of the representations or warranties of the Buyer contained in this Agreement or in any instrument delivered by or on behalf of the Buyer pursuant to this Agreement, as of the date such representation or warranty was made; or

any breach or non-fulfillment of any covenant, agreement or obligation to be performed by the Buyer pursuant to this Agreement.

Certain Limitations. Notwithstanding anything to the contrary in this Agreement, the aggregate amount of all Damages for which the Sellers shall be liable pursuant to Section 9(a) shall not exceed 100% of the Purchase Price.

Indemnification Procedures.

Buyer or a Seller (each, an “Indemnitee”) agrees that promptly after it becomes aware of facts giving rise to a claim by it for indemnification pursuant to this Section 9, including receipt by it of notice of any action, suit, arbitration proceeding, citation, summons or subpoena (civil, criminal, regulatory or otherwise) in law or in equity (a “Proceeding”), by any third party with respect to any matter as to which it claims to be entitled to indemnity under the provisions of this Agreement, such Indemnitee must assert its claim for indemnification under this Section 9 (each, a “Claim”) by providing a written notice (a “Claim Notice”) to the indemnifying party allegedly required to provide indemnification protection under this Section 9 specifying, in reasonable detail, the nature and basis for such Claim (e.g., the underlying representation, warranty, covenant or agreement alleged to have been breached). Such notice shall include a demand for indemnification under this Agreement. Notwithstanding the foregoing, an Indemnitee’s failure to send or delay in sending a third party Claim Notice will not relieve the indemnifying party from liability hereunder with respect to such Claim except to the extent the indemnifying party is prejudiced by such failure or delay and except as is otherwise provided herein. Except as specifically provided herein, each Indemnitee’s rights and remedies under this Section 9 will survive the Closing.

In the event of the assertion of any third party Claim for which, by the terms hereof, an Indemnitee seeks indemnification from an indemnifying party, the indemnifying party will have the right, at such indemnifying party’s expense, to assume the defense of same including the appointment and selection of counsel on behalf of the Indemnitee so long as such counsel is reasonably acceptable to the Indemnitee. If the indemnifying party elects to assume the defense of any such third party Claim, it shall within twenty (20) business days of its receipt of the Claim Notice notify the Indemnitee in writing of its intent to do so. Any such contest may be conducted in the

If requested by the indemnifying party, the Indemnitee agrees to cooperate with the indemnifying party and its counsel in contesting any third party Claim that the indemnifying party elects to contest or, if appropriate, in making any counterclaim against the person asserting the third party Claim, or any cross-complaint against any person, and the indemnifying party will reimburse the Indemnitee for reasonable expenses incurred by it in so cooperating. At no cost or expense to the Indemnitee, the indemnifying party shall reasonably cooperate with the Indemnitee and its counsel in contesting any third party Claim.

Notwithstanding anything to the contrary in this Agreement, the indemnifying party will not be permitted to settle, compromise, take any corrective or remedial action or enter into an agreed judgment or consent decree, in each case, that subjects the Indemnitee to any injunctive or other non-monetary relief or any criminal liability, requires an admission of guilt or wrongdoing on the part of the Indemnitee or imposes any continuing obligation on or requires any payment from the Indemnitee without the Indemnitee’s prior written consent.

Calculation of Damages. In calculating amounts payable to an Indemnitee for a claim for indemnification hereunder, the amount of any indemnified Damages shall be determined without duplication of any other Damages for which an indemnification claim has been made or could be made under any other representation, warranty, covenant or agreement and shall be computed net of (i) payments actually recovered under any insurance policy with respect to such Damages or (ii) any prior or subsequent actual recovery from any person other than the applicable indemnifying party with respect to such Damages.

Waiver of Certain Damages. Notwithstanding any other provision of this Agreement, in no event shall any Party be liable pursuant to this Section 9 for punitive, special, indirect, consequential, remote, speculative or lost profits Damages of any kind or nature, including any Damages based on diminution in value or any other damages based on a multiple of earnings or other multiple, regardless of the form of action through which such damages are sought, except (i) for any such damages recovered by any third party against an Indemnitee in respect of which such Indemnitee would otherwise be entitled to indemnification pursuant to the terms hereof and (ii) in the case of consequential damages, (x) to the extent an Indemnitee is required to pay consequential damages to an unrelated third party and (y) to the extent of consequential damages to an Indemnitee arising from fraud or willful misconduct.

Sole Remedy. After the Closing, no Party shall have liability under this Agreement or the transactions contemplated hereby except as is provided in this Section 9 (other than claims or causes of action arising from fraud, and other than claims for specific performance).

General Provisions.

Reliance. Each Party is entitled to rely upon this Agreement and is irrevocably authorized to produce this Agreement or a copy hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby.

Confidentiality. No Party shall issue any press release or other public disclosure of any Party (or the identity of their respective affiliates) as a party to this Agreement or of the transactions contemplated hereby without the prior written consent of the other Parties, except to the extent required by the rules or regulations of any stock exchange or securities authority. For avoidance of doubt, nothing prohibits disclosures to a party to the Business Combination Agreement, their brokers, or their lenders.

Expenses. Each Party shall pay all of its own expenses in connection with this Agreement and the transactions contemplated hereby. Each Party confirms that no other Party shall be required to pay any fee to any broker or finder for any brokerage fees, commissions, or finder’s fees in connection with the transactions contemplated by this Agreement.

Accuracy. Each Party agrees to promptly notify the other Parties if any of the representations, warranties, acknowledgments, understandings or agreements set forth herein are no longer accurate in all material respects.

Notices. Any notice or communication required or permitted hereunder shall be in writing and either delivered personally, emailed, sent by overnight mail via a reputable overnight carrier, or sent by certified or registered mail, postage prepaid, and shall be deemed to be given and received (i) when so delivered personally, (i) when sent, with no mail undeliverable or other rejection notice, if sent by email, (iii) five days after the date of mailing by registered or certified mail (postage prepaid, return receipt requested), (iv) the business day after the date of mailing by pre-paid reputable overnight carrier, to the address below or to such other address or addresses as such person may hereafter designate by notice given hereunder.

Assignment. Except as otherwise provided herein, this Agreement shall be binding upon, and inure to the benefit of the Parties hereto and their heirs, executors, administrators, successors, legal representatives, and permitted assigns, and the agreements, representations, warranties, covenants and acknowledgments contained herein shall be deemed to be made by, and be binding upon, such heirs, executors, administrators, successors, legal representatives and permitted assigns. Neither this Agreement nor any rights that may accrue to any Party hereunder may be transferred or assigned without the prior written consent of the other Parties. Any purported assignment in violation hereof shall be null and void ab initio.

Third Party Beneficiaries. Nothing in this Agreement, express or implied, is intended to or shall confer upon any person or entity (other than the Parties hereto) any rights, benefits or remedies of any nature whatsoever under or by reason of this Agreement.

Severability. If any provision of this Agreement shall be invalid, illegal or unenforceable, the validity, legality or enforceability of the remaining provisions of this Agreement shall not in any way be affected or impaired thereby and shall continue in full force and effect. Upon such determination that any provision is invalid, illegal or incapable of being enforced, the Parties shall negotiate in good faith to modify this Agreement so as to effect the original intent of the Parties as closely as possible in an acceptable manner to the end that the transactions contemplated hereby are fulfilled to the fullest extent possible.

References. The headings contained in this Agreement are for reference purposes only and shall not affect in any way the meaning or interpretation of this Agreement. When reference is made in this Agreement to a Section, such reference shall be to a Section of this Agreement unless otherwise indicated. Whenever the words “include,” “includes” or “including” are used in this Agreement, they shall be deemed to be followed by the words “without limitation.” The words “hereof,” “herein,” “hereby” and “hereunder” and words of similar import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. Whenever used in this Agreement, any noun or pronoun shall be deemed to include the plural as well as the singular and to cover all genders.

Construction. No uncertainty or ambiguity herein shall be construed or resolved against any Party, whether under any rule of construction or otherwise. This Agreement shall be construed without regard to any presumption or rule requiring construction or interpretation against the party drafting or causing any instrument to be drafted. The Parties acknowledge and agree that this Agreement has been reviewed, negotiated and accepted by all Parties and shall be construed and interpreted according to the ordinary meaning of the words used so as to fairly accomplish the purposes and intentions of all the Parties.

Amendment and Waiver. This Agreement may not be amended or modified, nor any provision hereof waived, except by an instrument in writing, signed by all of the Parties.

Complete Agreement. This Agreement constitutes the entire agreement, and supersedes all other prior agreements, understandings, representations and warranties, both written and oral, among the Parties, with respect to the subject matter hereof.

Counterparts. This Agreement may be executed in two or more counterparts (including by electronic means), all of which shall be considered one and the same agreement and shall become effective when signed by each of the Parties and delivered to the other Parties, it being understood that all Parties need not sign the same counterpart.

Consent to Jurisdiction; Waiver of Jury Trial; Etc. Each Party (i) irrevocably consents to the service of the summons and complaint and any other process in any action or proceeding relating to the transactions contemplated by this Agreement, for and on behalf of itself or any of its properties or assets, in accordance with this Section 10(n) or in such other manner as may be permitted by applicable law, that such process may be served in the manner of giving notices in Section 10(e) and that nothing in this Section 10(n) shall affect the right of any Party to serve legal process in any other manner permitted by applicable law, (ii) irrevocably and unconditionally consents and submits itself and its properties and assets in any action or proceeding to the exclusive general jurisdiction of the Court of Chancery of the State of Delaware and any state appellate court therefrom located within the State of Delaware (or, only if the Chancery Court declines to accept jurisdiction over a particular matter, any state or federal court within the State of Delaware) (the “Chosen Courts”) in the event any dispute or controversy arises out of this Agreement or the transactions contemplated hereby, or for recognition and enforcement of any order in respect thereof, (iii) agrees that it will not attempt to deny or defeat such personal jurisdiction by motion or other request for leave from any such court, (iv) agrees that any actions or proceedings arising in connection with this Agreement or the transactions contemplated hereby shall be brought, tried and determined only in the Chosen Courts, (v) waives any objection that it may now or hereafter have to the venue of any such action or proceeding in any such court or that such action or proceeding was brought in an inconvenient court and agrees not to plead or claim the same and (vi) agrees that it will not bring any action relating to this Agreement or the transactions contemplated hereby in any court other than the Chosen Courts. Each Party agrees that a final order in any action or proceeding in such courts as provided above shall be conclusive and may be enforced in other jurisdictions by suit on the order or in any other manner provided by applicable law. THE PARTIES EACH HEREBY WAIVE, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY RIGHT TO TRIAL BY JURY OF ANY CLAIM, DEMAND, ACTION, OR CAUSE OF ACTION (I) ARISING UNDER THIS AGREEMENT OR (II) IN ANY WAY CONNECTED WITH OR RELATED OR INCIDENTAL TO THE DEALINGS OF THE PARTIES IN RESPECT OF THIS AGREEMENT OR ANY OF THE TRANSACTIONS RELATED HERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING, AND WHETHER IN CONTRACT, TORT, EQUITY, OR OTHERWISE. EACH PARTY HEREBY AGREES AND CONSENTS THAT ANY SUCH CLAIM, DEMAND, ACTION, OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT A JURY AND THAT THE PARTIES MAY FILE A COUNTERPART OF A COPY OF THIS AGREEMENT WITH ANY COURT AS WRITTEN EVIDENCE OF THE CONSENT OF THE PARTIES HERETO TO THE WAIVER OF THEIR RIGHT TO TRIAL BY JURY.

Governing Law. This Agreement, and all claims or causes of action based upon, arising out of, or related to this Agreement or the transactions contemplated hereby, shall be governed by, and construed in accordance with, the laws of the State of Delaware, without giving effect to principles or rules of conflict of laws (whether of the State of Delaware or any other jurisdiction) to the extent such principles or rules would require or permit the application of laws of another jurisdiction.

Assignment by Assignor. For value received, the receipt and sufficiency of which are hereby acknowledged, upon the execution of this Assignment by the Parties, Assignor does hereby assign, transfer and convey the Assigned Interest to Assignee, including, without limitation, Assignor’s rights, title and interest in and to (a) Assignor’s capital account that is attributable to the Assigned Interest, (b) Assignor’s right to receive profits, compensation, and other distributions from the Partnership that are attributable to the Assigned Interest (including, without limitation, all rights of Assignor to receive its respective distributions attributable to the Assigned Interest which accrue after the date

Select Fund, assumes December 21, 2020 Closing Date.

Income Fund, assumes December 21, 2020 Closing Date.

Assumption. Assignee hereby assumes and agrees to pay or perform all obligations arising on or after the date hereof in connection with the Assigned Interest.

Continuation of the Partnership. The Parties agree that the transfer, assignment and conveyance of the Assigned Interest shall not dissolve the Partnership and that the business of the Partnership shall continue.

Future Cooperation. Each of the Parties agrees to cooperate at all times from and after the date hereof with respect to all of the matters described herein, and to execute such further assignments, releases, assumptions and/or amendments of the Partnership Agreement, notifications and other documents as may be reasonably requested for the purpose of giving effect to, or evidencing or giving notice of, the transactions contemplated by this Assignment.

Binding Effect. This Assignment shall be binding upon, and shall inure to the benefit of, the Parties and their respective successors and assigns.

Governing Law. This Assignment shall be governed by, and interpreted in accordance with, the laws of the State of Delaware, all rights and remedies being governed by such laws.

Counterparts. This Assignment may be executed in several counterparts, each of which shall be an original, but of all which taken together shall constitute one and the same instrument. Delivery of an executed counterpart of a signature page of this Assignment by telecopy or electronically in a portable document format shall be effective as delivery of a manually executed counterpart of this Assignment. Counterpart signature pages may be attached to a copy of this Assignment to form a single document containing all of the signatures of the Parties.