Fins may move.Logical formLearned from4 sentences. Bases may pertain-to anal fins.Logical formLearned from4 sentences. Fins can be spineless.Logical formLearned from4 sentences. Fins may retract.Logical formLearned from4 sentences. (Stabilizer fins) can be vertical.Logical formLearned from4 sentences. Some spines can be on an anal fin.Logical formLearned from4 sentences. Some fins can be at a rear.Logical formLearned from4 sentences. A hint can be constituted-of-or-filled-with fins.Logical formLearned from4 sentences. An anal fin can be extensive.Logical formLearned from4 sentences. Fins can be rounded.Logical formLearned from4 sentences. A dorsal fin can be black.Logical formLearned from4 sentences. A dorsal fin can be sickle-shaped.Logical formLearned from4 sentences. A running can be between dorsal fins.Logical formLearned from4 sentences. An end may pertain-to a fin.Logical formLearned from4 sentences. A fin can be pointed.Logical formLearned from4 sentences.