Appendages can be hollow.Logical formLearned from6 sentences. A verb can be hollow.Logical formLearned from6 sentences. (Glass tubes) can be hollow.Logical formLearned from6 sentences. A torus can be hollow.Logical formLearned from6 sentences. A temple can be hollow.Logical formLearned from6 sentences. Stones can be hollow.Logical formLearned from6 sentences. A wave can be hollow.Logical formLearned from6 sentences. Shapes can be hollow.Logical formLearned from6 sentences. A name can be hollow.Logical formLearned from6 sentences. A thread can be hollow.Logical formLearned from6 sentences. A record can be hollow.Logical formLearned from6 sentences. A (brazen horse) can be hollow.Logical formLearned from6 sentences. Cubes can be hollow.Logical formLearned from6 sentences. A board can be hollow.Logical formLearned from6 sentences. A wall can be hollow.Logical formLearned from6 sentences.