Masks can be hollow.Logical formLearned from3 sentences. Figures can be hollow.Logical formLearned from3 sentences. A (ground blade) can be hollow.Logical formLearned from3 sentences. Towers can be hollow.Logical formLearned from3 sentences. A rock can be hollow.Logical formLearned from3 sentences. A (publicity stunt) can be hollow.Logical formLearned from3 sentences. A medulla can be hollow.Logical formLearned from3 sentences. A meaning can be hollow.Logical formLearned from3 sentences. A timbre can be hollow.Logical formLearned from3 sentences. Formalities can be hollow.Logical formLearned from3 sentences. An (owl statue) can be hollow.Logical formLearned from3 sentences. (Charge projectiles) can be hollow.Logical formLearned from3 sentences. Barbs can be hollow.Logical formLearned from3 sentences. Timber can be hollow.Logical formLearned from3 sentences. A being can be hollow.Logical formLearned from3 sentences.