A container can be hollow.Logical formLearned from18 sentences. A right can be hollow.Logical formLearned from18 sentences. Stars can be hollow.Logical formLearned from18 sentences. A glass can be hollow.Logical formLearned from18 sentences. Objects can be hollow.Logical formLearned from18 sentences. A hollow man may despise culture.Logical formLearned from18 sentences. A promise can be hollow.Logical formLearned from18 sentences. A neighborhood can be hollow.Logical formLearned from18 sentences. Apologies can be hollow.Logical formLearned from18 sentences. Platitudes can be hollow.Logical formLearned from18 sentences. A life can be hollow.Logical formLearned from18 sentences. A campaign can be hollow.Logical formLearned from18 sentences. Reeds can be hollow.Logical formLearned from18 sentences. Threats can be hollow.Logical formLearned from18 sentences. A (plastic tube) can be hollow.Logical formLearned from18 sentences.