Forces can be hollow.Logical formLearned from27 sentences. Polymers can be hollow.Logical formLearned from27 sentences. A military can be hollow.Logical formLearned from27 sentences. A rod can be hollow.Logical formLearned from27 sentences. Promises can be hollow.Logical formLearned from27 sentences. A (metal tube) can be hollow.Logical formLearned from26 sentences. A device can be hollow.Logical formLearned from26 sentences. Promises may ring hollow.Logical formLearned from26 sentences. A face can be hollow.Logical formLearned from26 sentences. Victories can be hollow.Logical formLearned from26 sentences. Columns can be hollow.Logical formLearned from26 sentences. Forms can be hollow.Logical formLearned from26 sentences. Powers can be hollow.Logical formLearned from25 sentences. The earth can be hollow.Logical formLearned from25 sentences. An experience can be hollow.Logical formLearned from25 sentences.