A relationship can be hollow.Logical formLearned from7 sentences. A set can be hollow.Logical formLearned from7 sentences. A mouth can be hollow.Logical formLearned from7 sentences. An ataraxia can be hollow.Logical formLearned from7 sentences. A limb can be hollow.Logical formLearned from7 sentences. A hull can be hollow.Logical formLearned from7 sentences. A waveguide can be hollow.Logical formLearned from7 sentences. A region can be hollow.Logical formLearned from7 sentences. (Tree cavities) can be hollow.Logical formLearned from7 sentences. Domes can be hollow.Logical formLearned from7 sentences. A studio can be hollow.Logical formLearned from7 sentences. Restorations can be hollow.Logical formLearned from7 sentences. A system can be hollow.Logical formLearned from7 sentences. Hunters can be hollow.Logical formLearned from7 sentences. Injuries can be hollow.Logical formLearned from7 sentences.