Document:

EX-10.2

 Exhibit 10.2 

STEALTH BIOTHERAPEUTICS CORP 

Incentive Option Agreement 
  

	1.	 Grant of Option. 

This agreement evidences the grant by Stealth BioTherapeutics Corp, a corporation incorporated under the laws of the Cayman Islands
(the “Company”), on [insert date of Board approval] (the “Grant Date”) to [insert name of Participant], an employee of the Company or a subsidiary thereof (the “Participant”), of an option to purchase,
in whole or in part, on the terms provided herein and in the Company’s 2006 Share Incentive Plan (the “Plan”), a total of [insert number of Option Shares] Ordinary Shares (the “Shares”), of a nominal par value of
$0.0001 per share, of the Company (the “Ordinary Shares”) at $[insert exercise price] per Share. Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on [insert date that is ten years after Board
approval] (the “Final Exercise Date”). 
 It is intended that the option evidenced by this agreement shall be an incentive stock
option as defined in Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the “Code”). Except as otherwise indicated by the context, the term “Participant”, as used in
this option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms. 
  

	2.	 Vesting Schedule. 

This option shall become exercisable (“vested”) as to [25]%1 of the Shares on
the [one-year] anniversary of the Commencement Date and the remaining [75]% shall vest in equal monthly installments (each installment being 2.083% of the Shares) over a period of [three] years, such that the
option is fully vested on the [fourth] anniversary of the Commencement Date. “Commencement Date” shall mean [insert date that vesting commences]. 

The right of exercise shall be cumulative so that to the extent the option is not exercised in any period to the maximum extent permissible it
shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of the Final Exercise Date or the termination of this option under Section 3 hereof or the Plan. 

 

	3.	 Exercise and Termination of Option; Repurchase Right. 

(a)    Form of Exercise. Each election to exercise this option shall be in writing, signed by the Participant, and
received by the Company at its principal office, accompanied by this agreement, and payment in full in the manner provided in the Plan. The Participant may purchase less than the number of shares covered hereby, provided that no partial exercise of
this option may be for any fractional share. 
 (b)    Continuous Relationship with the Company Required. Except
as otherwise provided in this Section 3, this option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an employee or officer or consultant of the
Company or any parent or subsidiary of the Company as defined in Section 424(e) or (f) of the Code (an “Eligible Participant”). 
  

 

	1 	 Vesting schedule subject to Board approval. 

 (c)    Termination of Relationship with the Company. If the
Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraphs (d) and (e) below, the right to exercise this option shall terminate three months after such cessation (but in no event
after the Final Exercise Date), provided that this option shall be exercisable only to the extent that the Participant was entitled to exercise this option on the date of such cessation. 

(d)    Exercise Period Upon Death or Disability. If the Participant dies or becomes disabled (within the meaning of
Section 22(e)(3) of the Code) prior to the Final Exercise Date while he or she is an Eligible Participant and the Company has not terminated such relationship for Cause (as defined in paragraph (e) below), this option shall be exercisable,
within the period of one year following the date of death or disability of the Participant, by the Participant (or in the case of death by an authorized transferee), provided that this option shall be exercisable only to the extent
that this option was exercisable by the Participant on the date of his or her death or disability, and further provided that this option shall not be exercisable after the Final Exercise Date. 

(e)    Termination for Cause; Breach of Certain Obligations. If, prior to the Final Exercise Date, the Participant
is discharged by the Company for Cause (as defined below) or the Participant violates the non-competition or confidentiality provisions of any agreement between the Participant and the Company, then
immediately upon notice from the Company to the Participant (i) the right to exercise this option, to the extent not previously exercised, shall terminate, and (ii) the Company shall have the right to repurchase all shares previously
issued upon exercise of this option at a repurchase price equal to the exercise price therefor. If the Company exercises the foregoing repurchase right, the Participant shall tender to the Company at its principal offices the certificate or
certificates representing the shares to be repurchased by the Company, duly endorsed in blank by the Participant or with duly endorsed stock/share powers attached thereto, all in a form suitable for transfer to the Company, and the Company shall
promptly thereafter deliver or mail to the Participant a check in payment of the repurchase price for such shares. The foregoing repurchase right shall terminate upon the earlier of the events specified in Section 4(g) below. “Cause”
shall mean willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, breach by the Participant of any provision of any employment, consulting,
advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), as determined by the Company, which determination shall be conclusive. The Participant shall be
considered to have been discharged for Cause if the Company determines, within 60 days after the Participant’s resignation, that discharge for Cause was warranted. 
  

	4.	 Company Right of First Refusal. 

(a)    Notice of Proposed Transfer. If the Participant proposes to sell, assign, transfer, pledge, hypothecate or
otherwise dispose of, by operation of law or otherwise (collectively, “transfer”) any Shares acquired upon exercise of this option, then the Participant shall first give written notice of the proposed transfer (the “Transfer
Notice”) to the Company. The Transfer Notice shall name the proposed transferee and state the number of such Shares the Participant proposes to transfer (the “Offered Shares”), the price per share and all other material terms and
conditions of the transfer. 

  
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 (b)    Company Right to Purchase. For 60 days following its
receipt of such Transfer Notice, the Company shall have the option to repurchase (subject to applicable law) all or part of the Offered Shares at the price and upon the terms set forth in the Transfer Notice. In the event the Company elects to
purchase all or part of the Offered Shares, it shall give written notice of such election to the Participant within such 60-day period. Within 10 days after his receipt of such notice, the Participant
shall tender to the Company at its principal offices the certificate or certificates representing the Offered Shares to be purchased by the Company, duly endorsed in blank by the Participant or with duly endorsed stock/share powers attached thereto,
all in a form suitable for transfer of the Offered Shares to the Company. Promptly following receipt of such certificate or certificates, the Company shall deliver or mail to the Participant a check in payment of the purchase price for such Offered
Shares; provided that if the terms of payment set forth in the Transfer Notice were other than cash against delivery, the Company may pay for the Offered Shares on the same terms and conditions as were set forth in the Transfer Notice;
and provided further that any delay in making such payment shall not invalidate the Company’s exercise of its option to purchase the Offered Shares. 

(c)    Shares Not Purchased By Company. If the Company does not elect to acquire all of the Offered Shares, the
Participant may, within the 60-day period following the expiration of the option granted to the Company under Section 4(b) above, transfer the Offered Shares which the Company has not elected to acquire
to the proposed transferee, provided that such transfer shall not be on terms and conditions more favorable to the transferee than those contained in the Transfer Notice. Notwithstanding any of the above, all Offered Shares transferred
pursuant to this Section 4 shall remain subject to the right of first refusal set forth in this Section 4 and such transferee shall, as a condition to such transfer, deliver to the Company a written instrument confirming that such
transferee shall be bound by all of the terms and conditions of this Section 4. 
 (d)    Consequences of Non-Delivery. After the time at which the Offered Shares are required to be delivered to the Company for transfer to the Company pursuant to Section 4(b) above, the Company shall not pay any dividend to the
Participant on account of such Offered Shares or permit the Participant to exercise any of the privileges or rights of a shareholder with respect to such Offered Shares, but shall, in so far as permitted by law, treat the Company as the owner of
such Offered Shares. 
 (e)    Exempt Transactions. The following transactions shall be exempt from the
provisions of this Section 4: 
 (1)    any transfer of Shares to or for the benefit of any spouse, children,
parents, uncles, aunts, siblings, nieces, nephews, grandchildren and any other relatives approved by the Board of Directors (collectively, “Approved Relatives”) or to a trust, corporation, limited liability company, partnership or other
entity established solely for the benefit of the Participant and/or Approved Relatives; 

  
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 (2)    any transfer pursuant to an effective registration statement
filed by the Company under the Securities Act of 1933, as amended (the “Securities Act”); and 

(3)    the sale of all or substantially all of the shares of the Company (including pursuant to a merger or
consolidation); 
 provided, however, that in the case of a transfer pursuant to clause (1) above, such Shares shall remain subject to
the right of first refusal set forth in this Section 4 and such transferee shall, as a condition to such transfer, deliver to the Company a written instrument confirming that such transferee shall be bound by all of the terms and conditions of
this Section 4. 
 (f)    Assignment of Company Right. The Company may assign its rights to purchase Offered
Shares in any particular transaction under this Section 4 to one or more persons or entities. 

(g)    Termination. The provisions of this Section 4 shall terminate upon the earlier of the following events:

 (1)    the closing of the sale of Ordinary Shares in an underwritten public offering pursuant to an effective
registration statement filed by the Company under the Securities Act; or 
 (2)    the sale of all or substantially all
of the share capital, assets or business of the Company, by merger, consolidation, sale of assets or otherwise (other than a merger or consolidation in which all or substantially all of the individuals and entities who were beneficial owners of the
Ordinary Shares immediately prior to such transaction beneficially own, directly or indirectly, more than 75% of the outstanding securities entitled to vote generally in the election of directors of the resulting, surviving or acquiring corporation
in such transaction). 
 (h)    No Obligation to Recognize Invalid Transfer. The Company shall not be required
(1) to transfer on its books any of the Shares which shall have been sold or transferred in violation of any of the provisions set forth in this Section 4, or (2) to treat as owner of such Shares or to pay dividends to any transferee
to whom any such Shares shall have been so sold or transferred. 
 (i)    Legends. The certificate representing
Shares shall bear a legend substantially in the following form (in addition to, or in combination with, any legend required by applicable federal and state securities laws and agreements relating to the transfer of the Company securities): 

“The shares represented by this certificate are subject to a right of first refusal in favor of the Company, as provided in a certain
option agreement with the Company.” 

  
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	5.	 Agreement in Connection with Public Offering. 

The Participant agrees, in connection with the initial underwritten public offering of the Company’s securities pursuant to a
registration statement under the Securities Act, (i) not to sell, make short sale of, loan, grant any options for the purchase of, or otherwise dispose of any Ordinary Shares held by the Participant (other than those shares included in the
offering) without the prior written consent of the Company or the underwriters managing such initial underwritten public offering of the Company’s securities for a period of 180 days from the effective date of such registration statement, and
(ii) to execute any agreement reflecting clause (i) above as may be requested by the Company or the managing underwriters at the time of such offering. 
  

	6.	 Tax Matters. 

(a)    Withholding. No Shares will be issued pursuant to the exercise of this option unless and until the
Participant pays to the Company, or makes provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option. 

(b)    Disqualifying Disposition. If the Participant disposes of Shares acquired upon exercise of this option
within two years from the Grant Date or one year after such Shares were acquired pursuant to exercise of this option, the Participant shall notify the Company in writing of such disposition. 

 

	7.	 Nontransferability of Option. 

This option may not be sold, assigned, transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of
law, except by will or the laws of descent and distribution, and, during the lifetime of the Participant, this option shall be exercisable only by the Participant. 
  

	8.	 Provisions of the Plan. 

This option is subject to the provisions of the Plan, a copy of which is furnished to the Participant with this option. 

[Remainder of page intentionally left blank.] 
  

  
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 IN WITNESS WHEREOF, the Company has caused this option to be executed under its corporate
seal by its duly authorized officer. This option shall take effect as a sealed instrument. 
  

							
		 		 	STEALTH BIOTHERAPEUTICS CORP
				
	Dated:	 		 	By:	 	 
				
		 		 	Name:	 	 
				
		 		 	Title:	 	Authorized Signatory

  

 PARTICIPANT’S ACCEPTANCE 

The undersigned hereby accepts the foregoing option and agrees to the terms and conditions thereof. The undersigned hereby acknowledges
receipt of a copy of the Company’s 2006 Share Incentive Plan. 
  

	
	PARTICIPANT:
	
	   

	[Name]
	
	Address:

  

  
 7EX-10.3

 Exhibit 10.3 

STEALTH BIOTHERAPEUTICS CORP 

Nonstatutory Option Agreement 
  

	1.	 Grant of Option. 

This agreement evidences the grant by Stealth BioTherapeutics Corp, a corporation incorporated under the laws of the Cayman Islands
(the “Company”), on [insert date of Board approval] (the “Grant Date”) to [insert name of Participant], a [insert Participant’s position] of the Company or a subsidiary thereof (the “Participant”), of
an option to purchase, in whole or in part, on the terms provided herein and in the Company’s 2006 Share Incentive Plan (the “Plan”), a total of [insert number of Option Shares] Ordinary Shares (the “Shares”), of a
nominal par value of $0.0001 per share, of the Company (the “Ordinary Shares”) at $[insert exercise price] per Share. Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on [insert date that is ten
years after Board approval] (the “Final Exercise Date”). 
 It is intended that the option evidenced by this agreement shall not
be an incentive stock option as defined in Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the “Code”). Except as otherwise indicated by the context, the term
“Participant”, as used in this option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms. 
  

	2.	 Vesting Schedule. 

This option shall become exercisable (“vested”) as to [2.083]%1 Shares at the
end of each successive [one-month] period following the Commencement Date, such that the option is fully vested on the [fourth] anniversary of the Commencement Date. “Commencement Date” shall mean
[insert date vesting commences]. 
 The right of exercise shall be cumulative so that to the extent the option is not exercised in any
period to the maximum extent permissible it shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of the Final Exercise Date or the termination of this option under
Section 3 hereof or the Plan. 
  

	3.	 Exercise and Termination of Option; Repurchase Right. 

(a)    Form of Exercise. Each election to exercise this option shall be in writing, signed by the Participant, and
received by the Company at its principal office, accompanied by this agreement, and payment in full in the manner provided in the Plan. The Participant may purchase less than the number of shares covered hereby, provided that no partial exercise of
this option may be for any fractional share. 
 (b)    Continuous Relationship with the Company Required. Except
as otherwise provided in this Section 3, this option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an employee, officer, director, or consultant of
the Company or other entity the employees, officers, directors, consultants or advisors of which are eligible to receive option grants under the Plan (an “Eligible Participant”). 

 
  

	1 	 Vesting schedule subject to Board approval. 

 (c)    Termination of Relationship with the Company. If the
Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraphs (d) and (e) below, the right to exercise this option shall terminate three months after such cessation (but in no event
after the Final Exercise Date), provided that this option shall be exercisable only to the extent that the Participant was entitled to exercise this option on the date of such cessation. 

(d)    Exercise Period Upon Death or Disability. If the Participant dies or becomes disabled (within the meaning of
Section 22(e)(3) of the Code) prior to the Final Exercise Date while he or she is an Eligible Participant and the Company has not terminated such relationship for Cause (as defined in paragraph (e) below), this option shall be exercisable,
within the period of one year following the date of death or disability of the Participant, by the Participant (or in the case of death by an authorized transferee), provided that this option shall be exercisable only to the extent
that this option was exercisable by the Participant on the date of his or her death or disability, and further provided that this option shall not be exercisable after the Final Exercise Date. 

(e)    Termination for Cause; Breach of Certain Obligations. If, prior to the Final Exercise Date, the Participant
is discharged by the Company for Cause (as defined below) or the Participant violates the non-competition or confidentiality provisions of any agreement between the Participant and the Company, then
immediately upon notice from the Company to the Participant (i) the right to exercise this option, to the extent not previously exercised, shall terminate, and (ii) the Company shall have the right to repurchase all shares previously
issued upon exercise of this option at a repurchase price equal to the exercise price therefor. If the Company exercises the foregoing repurchase right, the Participant shall tender to the Company at its principal offices the certificate or
certificates representing the shares to be repurchased by the Company, duly endorsed in blank by the Participant or with duly endorsed stock/share powers attached thereto, all in a form suitable for transfer to the Company, and the Company shall
promptly thereafter deliver or mail to the Participant a check in payment of the repurchase price for such shares. The foregoing repurchase right shall terminate upon the earlier of the events specified in Section 4(g) below. “Cause”
shall mean willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, breach by the Participant of any provision of any employment, consulting,
advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), as determined by the Company, which determination shall be conclusive. The Participant shall be
considered to have been discharged for Cause if the Company determines, within 60 days after the Participant’s resignation, that discharge for Cause was warranted. 
  

	4.	 Company Right of First Refusal. 

(a)    Notice of Proposed Transfer. If the Participant proposes to sell, assign, transfer, pledge, hypothecate or
otherwise dispose of, by operation of law or otherwise (collectively, “transfer”) any Shares acquired upon exercise of this option, then the Participant shall first give written notice of the proposed transfer (the “Transfer
Notice”) to the Company. The Transfer Notice shall name the proposed transferee and state the number of such Shares the Participant proposes to transfer (the “Offered Shares”), the price per share and all other material terms and
conditions of the transfer. 

  
 2 

 (b)    Company Right to Purchase. For 60 days following its
receipt of such Transfer Notice, the Company shall have the option to repurchase (subject to applicable law) all or part of the Offered Shares at the price and upon the terms set forth in the Transfer Notice. In the event the Company elects to
purchase all or part of the Offered Shares, it shall give written notice of such election to the Participant within such 60-day period. Within 10 days after his receipt of such notice, the Participant
shall tender to the Company at its principal offices the certificate or certificates representing the Offered Shares to be purchased by the Company, duly endorsed in blank by the Participant or with duly endorsed stock/share powers attached thereto,
all in a form suitable for transfer of the Offered Shares to the Company. Promptly following receipt of such certificate or certificates, the Company shall deliver or mail to the Participant a check in payment of the purchase price for such Offered
Shares; provided that if the terms of payment set forth in the Transfer Notice were other than cash against delivery, the Company may pay for the Offered Shares on the same terms and conditions as were set forth in the Transfer Notice;
and provided further that any delay in making such payment shall not invalidate the Company’s exercise of its option to purchase the Offered Shares. 

(c)    Shares Not Purchased By Company. If the Company does not elect to acquire all of the Offered Shares, the
Participant may, within the 60-day period following the expiration of the option granted to the Company under Section 4(b) above, transfer the Offered Shares which the Company has not elected to acquire
to the proposed transferee, provided that such transfer shall not be on terms and conditions more favorable to the transferee than those contained in the Transfer Notice. Notwithstanding any of the above, all Offered Shares transferred
pursuant to this Section 4 shall remain subject to the right of first refusal set forth in this Section 4 and such transferee shall, as a condition to such transfer, deliver to the Company a written instrument confirming that such
transferee shall be bound by all of the terms and conditions of this Section 4. 
 (d)    Consequences of Non-Delivery. After the time at which the Offered Shares are required to be delivered to the Company for transfer to the Company pursuant to Section 4(b) above, the Company shall not pay any dividend to the
Participant on account of such Offered Shares or permit the Participant to exercise any of the privileges or rights of a shareholder with respect to such Offered Shares, but shall, in so far as permitted by law, treat the Company as the owner of
such Offered Shares. 
 (e)    Exempt Transactions. The following transactions shall be exempt from the
provisions of this Section 4: 
 (1)    any transfer of Shares to or for the benefit of any spouse, children,
parents, uncles, aunts, siblings, nieces, nephews, grandchildren and any other relatives approved by the Board of Directors (collectively, “Approved Relatives”) or to a trust, corporation, limited liability company, partnership or other
entity established solely for the benefit of the Participant and/or Approved Relatives; 

  
 3 

 (2)    any transfer pursuant to an effective registration statement
filed by the Company under the Securities Act of 1933, as amended (the “Securities Act”); and 

(3)    the sale of all or substantially all of the shares of the Company (including pursuant to a merger or
consolidation); 
 provided, however, that in the case of a transfer pursuant to clause (1) above, such Shares shall remain subject to
the right of first refusal set forth in this Section 4 and such transferee shall, as a condition to such transfer, deliver to the Company a written instrument confirming that such transferee shall be bound by all of the terms and conditions of
this Section 4. 
 (f)    Assignment of Company Right. The Company may assign its rights to purchase Offered
Shares in any particular transaction under this Section 4 to one or more persons or entities. 

(g)    Termination. The provisions of this Section 4 shall terminate upon the earlier of the following events:

 (1)    the closing of the sale of Ordinary Shares in an underwritten public offering pursuant to an effective
registration statement filed by the Company under the Securities Act; or 
 (2)    the sale of all or substantially all
of the share capital, assets or business of the Company, by merger, consolidation, sale of assets or otherwise (other than a merger or consolidation in which all or substantially all of the individuals and entities who were beneficial owners of the
Ordinary Shares immediately prior to such transaction beneficially own, directly or indirectly, more than 75% of the outstanding securities entitled to vote generally in the election of directors of the resulting, surviving or acquiring corporation
in such transaction). 
 (h)    No Obligation to Recognize Invalid Transfer. The Company shall not be required
(1) to transfer on its books any of the Shares which shall have been sold or transferred in violation of any of the provisions set forth in this Section 4, or (2) to treat as owner of such Shares or to pay dividends to any transferee
to whom any such Shares shall have been so sold or transferred. 
 (i)    Legends. The certificate representing
Shares shall bear a legend substantially in the following form (in addition to, or in combination with, any legend required by applicable federal and state securities laws and agreements relating to the transfer of the Company securities): 

“The shares represented by this certificate are subject to a right of first refusal in favor of the Company, as provided in a certain
option agreement with the Company.” 

  
 4 

	5.	 Agreement in Connection with Public Offering. 

The Participant agrees, in connection with the initial underwritten public offering of the Company’s securities pursuant to a
registration statement under the Securities Act, (i) not to sell, make short sale of, loan, grant any options for the purchase of, or otherwise dispose of any Ordinary Shares held by the Participant (other than those shares included in the
offering) without the prior written consent of the Company or the underwriters managing such initial underwritten public offering of the Company’s securities for a period of 180 days from the effective date of such registration statement, and
(ii) to execute any agreement reflecting clause (i) above as may be requested by the Company or the managing underwriters at the time of such offering. 
  

	6.	 Tax Matters. 

(a)    Withholding. No Shares will be issued pursuant to the exercise of this option unless and until the
Participant pays to the Company, or makes provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option. 

(b)    Disqualifying Disposition. If the Participant disposes of Shares acquired upon exercise of this option
within two years from the Grant Date or one year after such Shares were acquired pursuant to exercise of this option, the Participant shall notify the Company in writing of such disposition. 

 

	7.	 Nontransferability of Option. 

This option may not be sold, assigned, transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of
law, except by will or the laws of descent and distribution, and, during the lifetime of the Participant, this option shall be exercisable only by the Participant. 
  

	8.	 Provisions of the Plan. 

This option is subject to the provisions of the Plan, a copy of which is furnished to the Participant with this option. 

[Remainder of page intentionally left blank.] 
  

  
 5 

 IN WITNESS WHEREOF, the Company has caused this option to be executed under its corporate
seal by its duly authorized officer. This option shall take effect as a sealed instrument. 
  

							
		 		 	STEALTH BIOTHERAPEUTICS CORP
				
	Dated:	 		 	By:	 	 
				
		 		 	Name:	 	 
				
		 		 	Title:	 	Authorized Signatory

  

 PARTICIPANT’S ACCEPTANCE 

The undersigned hereby accepts the foregoing option and agrees to the terms and conditions thereof. The undersigned hereby acknowledges
receipt of a copy of the Company’s 2006 Share Incentive Plan. 
  

	
	PARTICIPANT:
	
	   

	[Name]
	
	Address:

  

  
 7

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