Others can be hollow.Logical formLearned from1 sentences. A tabletop can be hollow.Logical formLearned from1 sentences. A permanent magnet can be hollow.Logical formLearned from1 sentences. A hyoid bone can be hollow.Logical formLearned from1 sentences. (Glass bricks) can be hollow.Logical formLearned from1 sentences. Nests can be in a hollow tree.Logical formLearned from1 sentences. (Hemp stems) can be hollow.Logical formLearned from1 sentences. A (beryllium sphere) can be hollow.Logical formLearned from1 sentences. (Bronze hemispheres) can be hollow.Logical formLearned from1 sentences. (Construction blocks) can be hollow.Logical formLearned from1 sentences. An (iron pipe) can be hollow.Logical formLearned from1 sentences. A (wood body) can be hollow.Logical formLearned from1 sentences. (Metal plates) can be hollow.Logical formLearned from1 sentences. A (steel plunger) can be hollow.Logical formLearned from1 sentences. A (sauropod backbone) can be hollow.Logical formLearned from1 sentences.