A dignity can be stiff.Logical formLearned from14 sentences. Lines can be stiff.Logical formLearned from14 sentences. A dialogue can be stiff.Logical formLearned from14 sentences. A tongue can be stiff.Logical formLearned from14 sentences. A stiff upper lip may tremble.Logical formLearned from14 sentences. A wife can be stiff.Logical formLearned from14 sentences. A foam can be stiff.Logical formLearned from14 sentences. (Egg whites) can be stiff.Logical formLearned from14 sentences. A male may pull stiff.Logical formLearned from14 sentences. Leather can be stiff.Logical formLearned from14 sentences. Jaws can be stiff.Logical formLearned from14 sentences. A base can be stiff.Logical formLearned from14 sentences. (Steel shafts) can be stiff.Logical formLearned from14 sentences. Legs may get stiff.Logical formLearned from14 sentences. An interfacing can be stiff.Logical formLearned from14 sentences.