A (tree stump) can be hollow.Logical formLearned from16 sentences. A word can be hollow.Logical formLearned from16 sentences. A path can be hollow.Logical formLearned from16 sentences. A stone can be hollow.Logical formLearned from16 sentences. A (sex kitten) can be hollow.Logical formLearned from16 sentences. Questions can be hollow.Logical formLearned from16 sentences. An (oak tree) can be hollow.Logical formLearned from16 sentences. A drive can be hollow.Logical formLearned from16 sentences. Canes can be hollow.Logical formLearned from16 sentences. A sham can be hollow.Logical formLearned from16 sentences. Spots can be hollow.Logical formLearned from16 sentences. A cheek can be hollow.Logical formLearned from16 sentences. A justification can be hollow.Logical formLearned from16 sentences. An election can be hollow.Logical formLearned from16 sentences. Words may ring hollow.Logical formLearned from16 sentences.