A conduit can be hollow.Logical formLearned from2 sentences. Wood may sound hollow.Logical formLearned from2 sentences. (Metal bars) can be hollow.Logical formLearned from2 sentences. Messages can be hollow.Logical formLearned from2 sentences. Caricatures can be hollow.Logical formLearned from2 sentences. Successes can be hollow.Logical formLearned from2 sentences. A demand can be hollow.Logical formLearned from2 sentences. (Steel joints) can be hollow.Logical formLearned from2 sentences. A clanging can be hollow.Logical formLearned from2 sentences. A mound can be hollow.Logical formLearned from2 sentences. Gambits can be hollow.Logical formLearned from2 sentences. Promises may prove hollow.Logical formLearned from2 sentences. A promise of a male can be hollow.Logical formLearned from2 sentences. A (pep talk) can be hollow.Logical formLearned from2 sentences. A novel may feel hollow.Logical formLearned from2 sentences.