A half-cylinder can be hollow.Logical formLearned from2 sentences. Agates can be hollow.Logical formLearned from2 sentences. Outgrowths can be hollow.Logical formLearned from2 sentences. The ground may sound hollow.Logical formLearned from2 sentences. A die can be hollow.Logical formLearned from2 sentences. Moldings can be hollow.Logical formLearned from2 sentences. A (bulb end) can be hollow.Logical formLearned from2 sentences. Music can be hollow.Logical formLearned from2 sentences. (Neon atoms) can be hollow.Logical formLearned from2 sentences. A foam can be hollow.Logical formLearned from2 sentences. Mock-ups can be hollow.Logical formLearned from2 sentences. A lady can be hollow.Logical formLearned from2 sentences. A table can be hollow.Logical formLearned from2 sentences. Communism may sound hollow to persons.Logical formLearned from2 sentences. Consolations can be hollow.Logical formLearned from2 sentences.