A shell may pertain-to a person.Logical formLearned from2 814 sentences. A shell may pertain-to a male.Logical formLearned from2 297 sentences. A shell can be empty.Logical formLearned from1 678 sentences. A shell can be hard.Logical formLearned from1 261 sentences. A shell may pertain-to a female.Logical formLearned from1 081 sentences. Shells can be empty.Logical formLearned from807 sentences. A shell may pertain-to a self.Logical formLearned from713 sentences. A shell may pertain-to an ear.Logical formLearned from649 sentences. A (shell length) can be recorded.Logical formLearned from636 sentences. A shell can be hollow.Logical formLearned from577 sentences. A shell can be protective.Logical formLearned from464 sentences. A shell can be thin.Logical formLearned from454 sentences. A shell can be adult.Logical formLearned from453 sentences. A size of a shell may vary between some mms.Logical formLearned from375 sentences. A (shell size) may vary between some mms.Logical formLearned from353 sentences.