An imitation can be hollow.Logical formLearned from8 sentences. Axles can be hollow.Logical formLearned from8 sentences. A (propeller shaft) can be hollow.Logical formLearned from8 sentences. A pumpkin can be hollow.Logical formLearned from8 sentences. Twigs can be hollow.Logical formLearned from8 sentences. A core can be hollow.Logical formLearned from8 sentences. Stems can be hollow.Logical formLearned from8 sentences. Beams can be hollow.Logical formLearned from8 sentences. A model can be hollow.Logical formLearned from8 sentences. A hypothesis can be hollow.Logical formLearned from8 sentences. Products can be hollow.Logical formLearned from8 sentences. Feet can be hollow.Logical formLearned from8 sentences. Containers can be hollow.Logical formLearned from8 sentences. A coin can be hollow.Logical formLearned from8 sentences. (Concrete blocks) can be hollow.Logical formLearned from8 sentences.