A stomach can be hollow.Logical formLearned from5 sentences. A bang can be hollow.Logical formLearned from5 sentences. A frontier can be hollow.Logical formLearned from5 sentences. A call can be hollow.Logical formLearned from5 sentences. A din can be hollow.Logical formLearned from5 sentences. A shadow can be hollow.Logical formLearned from5 sentences. Hollow hopes can be in hearts of persons.Logical formLearned from5 sentences. Victories may prove hollow.Logical formLearned from5 sentences. (Steel pipes) can be hollow.Logical formLearned from5 sentences. Pins can be hollow.Logical formLearned from5 sentences. An assertion may ring hollow.Logical formLearned from5 sentences. Talk may ring hollow.Logical formLearned from5 sentences. A screw can be hollow.Logical formLearned from4 sentences. Stomaches can be hollow.Logical formLearned from4 sentences. A wrist can be hollow.Logical formLearned from4 sentences.