Assertion: walrus's limb | /r/HasProperty | modified into thick layer of blubber
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Source sentences:
text: a large gregarious marine mammal (Odobenus rosmarus of the family Odobenidae) of arctic waters related to the seals that has limbs modified into webbed flippers, long ivory tusks, a tough wrinkled hide, stiff whiskers, and a thick layer of blubber