Assertion: woolly mammoth | /r/CapableOf | become entombed in rock hard permafrost
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Source sentences:
text: The carcass puzzles are: (1) some carcasses and skeletons found in a general standing position, (2) three woolly mammoths and two woolly rhinos suffocated, (3) millions of animals became entombed in rock hard permafrost, and (4) some mammals have broken bones.