Assertion: snapping turtle's carapace | /r/CapableOf | flatten with 3 knobby keels
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Source sentences:
text: Carapace flattened with 3 knobby keels that become smooth with age; posterior margin of carapace strongly serrated; last 4 marginals on each side of midline strongly pointed; marginals 12/12, pleurals 4/4, and vertebrals 5 with little variation; hingeless plastron short (