A (lid approximation) can be rigid.Logical formLearned from8 sentences. Prohibitions can be rigid.Logical formLearned from8 sentences. A quarantine can be rigid.Logical formLearned from8 sentences. A monotheism can be rigid.Logical formLearned from8 sentences. Identities can be rigid.Logical formLearned from8 sentences. An ethic can be rigid.Logical formLearned from8 sentences. A (school system) can be rigid.Logical formLearned from8 sentences. Classes can be rigid.Logical formLearned from8 sentences. A force can be rigid.Logical formLearned from8 sentences. Stability can be rigid.Logical formLearned from8 sentences. A neck can be rigid.Logical formLearned from8 sentences. A (polyurethane foam) can be rigid.Logical formLearned from8 sentences. Themselves can be rigid.Logical formLearned from8 sentences. A proposal can be rigid.Logical formLearned from8 sentences. A (work schedule) can be rigid.Logical formLearned from8 sentences.