Assertion: lobster's relative | /r/HasProperty | a group of crustaceans
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Source sentences:
text: Crabs, lobsters, and their relatives (Malacostraca), also known as malacostracans, are a group of crustaceans that includes crabs, lobsters, shrimp, mantis shrimp, prawns, krill, spider crabs, woodlice and many others.