A castle can be hollow.Logical formLearned from2 sentences. A (steel ball) can be hollow.Logical formLearned from2 sentences. Frills can be hollow.Logical formLearned from2 sentences. Breakers can be hollow.Logical formLearned from2 sentences. A flattery can be hollow.Logical formLearned from2 sentences. Canes may be bored hollow.Logical formLearned from2 sentences. Bridges can be hollow.Logical formLearned from2 sentences. A (convenience store) can be hollow.Logical formLearned from2 sentences. (Table legs) can be hollow.Logical formLearned from2 sentences. Buds can be hollow.Logical formLearned from2 sentences. Resolutions can be hollow.Logical formLearned from2 sentences. Shafts can be hollow.Logical formLearned from2 sentences. A (drill string) can be hollow.Logical formLearned from2 sentences. An output can be hollow.Logical formLearned from2 sentences. An (aluminum core) can be hollow.Logical formLearned from2 sentences.