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  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
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      <link:roleType roleURI="http://pac.com/20250930/role/DocumentAndEntityInformation" id="DocumentAndEntityInformation">
        <link:definition>995300 - Document - Document And Entity Information</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://pac.com/20250930/role/SK1602SPACRegisteredOfferings" id="SK1602SPACRegisteredOfferings">
        <link:definition>995301 - Disclosure - S-K 1602, SPAC Registered Offerings</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://pac.com/20250930/role/SK1602a3ForepartSponsorCompensation" id="SK1602a3ForepartSponsorCompensation">
        <link:definition>995302 - Disclosure - S-K 1602(a)(3) Forepart, Sponsor Compensation</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://pac.com/20250930/role/SK1602a4ForepartAdjustedNTBV" id="SK1602a4ForepartAdjustedNTBV">
        <link:definition>995303 - Disclosure - S-K 1602(a)(4) Forepart, Adjusted NTBV</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>995304 - Disclosure - S-K 1602(b)(6) Prospectus Summary, Sponsor Compensation</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      </link:roleType>
      <link:roleType roleURI="http://pac.com/20250930/role/SK1602cDilution" id="SK1602cDilution">
        <link:definition>995305 - Disclosure - S-K 1602(c) Dilution</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://pac.com/20250930/role/SK1603SPACSponsorConflictsofInterest" id="SK1603SPACSponsorConflictsofInterest">
        <link:definition>995306 - Disclosure - S-K 1603, SPAC Sponsor; Conflicts of Interest</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://pac.com/20250930/role/SK1603aSPACSponsor" id="SK1603aSPACSponsor">
        <link:definition>995307 - Disclosure - S-K 1603(a) SPAC Sponsor</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://pac.com/20250930/role/SK1603a7SponsorControllingPersons" id="SK1603a7SponsorControllingPersons">
        <link:definition>995308 - Disclosure - S-K 1603(a)(7) Sponsor Controlling Persons</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://pac.com/20250930/role/SK1603a9RestrictionsonSellingSecurities" id="SK1603a9RestrictionsonSellingSecurities">
        <link:definition>995309 - Disclosure - S-K 1603(a)(9) Restrictions on Selling Securities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://pac.com/20250930/role/SK1603bConflictsofInterest" id="SK1603bConflictsofInterest">
        <link:definition>995310 - Disclosure - S-K 1603(b) Conflicts of Interest</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://pac.com/20250930/role/SK1603cFiduciaryDutiestoOtherCompanies" id="SK1603cFiduciaryDutiestoOtherCompanies">
        <link:definition>995311 - Disclosure - S-K 1603(c) Fiduciary Duties to Other Companies</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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