A (status quo) can be rigid.Logical formLearned from4 sentences. Dinghies can be rigid.Logical formLearned from4 sentences. Joints can be rigid.Logical formLearned from4 sentences. Rulers can be rigid.Logical formLearned from4 sentences. A (copper tubing) can be rigid.Logical formLearned from4 sentences. An (airship construction) can be rigid.Logical formLearned from4 sentences. Languages can be rigid.Logical formLearned from4 sentences. Ureteroscopes can be rigid.Logical formLearned from4 sentences. A cystoscope can be rigid.Logical formLearned from4 sentences. (Selection criteria) can be rigid.Logical formLearned from4 sentences. A nephroscope can be rigid.Logical formLearned from4 sentences. A photograph can be rigid.Logical formLearned from4 sentences. A pathway can be rigid.Logical formLearned from4 sentences. Cages can be rigid.Logical formLearned from4 sentences. A (component model) can be rigid.Logical formLearned from4 sentences.