A spine can be distinctive.Logical formLearned from4 sentences. A sigmoid flexure may pertain-to a spine.Logical formLearned from4 sentences. A length may pertain-to spines.Logical formLearned from4 sentences. Spines may point.Logical formLearned from4 sentences. A spine can be sensitive.Logical formLearned from4 sentences. A spine can be clear.Logical formLearned from4 sentences. Spines can be gray.Logical formLearned from4 sentences. Spines can be narrow.Logical formLearned from4 sentences. Some spines can be on an anal fin.Logical formLearned from4 sentences. A spine can be enlarged.Logical formLearned from4 sentences. A spine can be on a tail.Logical formLearned from4 sentences. A spine may pertain-to a jacket.Logical formLearned from4 sentences. A spine may undergo a lengthening.Logical formLearned from4 sentences. Rings can be constituted-of-or-filled-with spines.Logical formLearned from4 sentences. Spines can be calcareous.Logical formLearned from4 sentences.