Pieces can be hollow.Logical formLearned from15 sentences. A mall can be hollow.Logical formLearned from15 sentences. A horse can be hollow.Logical formLearned from15 sentences. A site can be hollow.Logical formLearned from15 sentences. A wind can be hollow.Logical formLearned from15 sentences. An attack can be hollow.Logical formLearned from15 sentences. A branch can be hollow.Logical formLearned from15 sentences. A tree can be hollow.Logical formLearned from15 sentences. A bamboo can be hollow.Logical formLearned from15 sentences. Generalizations can be hollow.Logical formLearned from15 sentences. An end can be hollow.Logical formLearned from15 sentences. Microspheres can be hollow.Logical formLearned from15 sentences. Statements can be hollow.Logical formLearned from15 sentences. The world can be hollow.Logical formLearned from15 sentences. A bar can be hollow.Logical formLearned from15 sentences.