A spine may protrude.Logical formLearned from4 sentences. A back can be on some side of a spine.Logical formLearned from4 sentences. Some discs can be in a spine.Logical formLearned from4 sentences. Spines can be razor-sharp.Logical formLearned from4 sentences. Spine may undergo a stiffening.Logical formLearned from4 sentences. A person may have a spine of steel.Logical formLearned from4 sentences. (Fluid leakings) can be from a spine.Logical formLearned from4 sentences. Nerves may pertain-to a spine.Logical formLearned from4 sentences. Senators may have a spine.Logical formLearned from4 sentences. A spine may pertain-to a state.Logical formLearned from4 sentences. Spines may face.Logical formLearned from4 sentences. A spine of a (mountain range) may rip_down a length.Logical formLearned from4 sentences. A sticker can be on spines.Logical formLearned from4 sentences. A spine may pertain-to an international-political-entity.Logical formLearned from4 sentences. A needle may be inserted into a spine.Logical formLearned from4 sentences.