A hump can be hollow.Logical formLearned from3 sentences. (Cancer researcher) may ring hollow to (cancer patients).Logical formLearned from3 sentences. A vinyl can be hollow.Logical formLearned from3 sentences. Jokes may feel hollow.Logical formLearned from3 sentences. A (gurgling sound) can be hollow.Logical formLearned from3 sentences. A suit can be hollow.Logical formLearned from3 sentences. Assurances can be hollow.Logical formLearned from3 sentences. A pinging can be hollow.Logical formLearned from3 sentences. Authorities can be hollow.Logical formLearned from3 sentences. A messiah can be hollow.Logical formLearned from3 sentences. (Gift boxes) can be hollow.Logical formLearned from3 sentences. A drum can be hollow.Logical formLearned from3 sentences. Answers to critics may ring hollow.Logical formLearned from3 sentences. A pyrrhic victory can be hollow.Logical formLearned from3 sentences. (Burner tubes) can be hollow.Logical formLearned from3 sentences.