C3's synthesis subject `samples` (a picture a party presents and does not
publish) met takedown's exhaustive match once both slices were in one tree
(E0004). Such samples are no item a holder serves or keeps for others, so a
closure claim whose subject they are adds no subject and needs no purge:
takedown §4.2 rule 3, the reference and its second implementation say so, and
the corpus's shared world gains such a claim, so every case exercises it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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