An acting can be hollow.Logical formLearned from5 sentences. A high can be hollow.Logical formLearned from5 sentences. A framework can be hollow.Logical formLearned from5 sentences. (Metal pipes) can be hollow.Logical formLearned from5 sentences. A shank can be hollow.Logical formLearned from5 sentences. A plan can be hollow.Logical formLearned from5 sentences. An article can be hollow.Logical formLearned from5 sentences. A bed can be hollow.Logical formLearned from5 sentences. A recess can be hollow.Logical formLearned from5 sentences. A choice can be hollow.Logical formLearned from5 sentences. A gimmick can be hollow.Logical formLearned from5 sentences. A (metal container) can be hollow.Logical formLearned from5 sentences. Openings can be hollow.Logical formLearned from5 sentences. A (plastic ball) can be hollow.Logical formLearned from5 sentences. Toys can be hollow.Logical formLearned from5 sentences.