Darkness can be hollow.Logical formLearned from6 sentences. Cathodes can be hollow.Logical formLearned from6 sentences. A walk can be hollow.Logical formLearned from6 sentences. Voices can be hollow.Logical formLearned from6 sentences. A viscus can be hollow.Logical formLearned from6 sentences. Ends can be hollow.Logical formLearned from6 sentences. A meaning can be hollow.Logical formLearned from6 sentences. A fear can be hollow.Logical formLearned from6 sentences. A response can be hollow.Logical formLearned from6 sentences. Companies may sound hollow.Logical formLearned from6 sentences. An apology can be hollow.Logical formLearned from6 sentences. A cavern can be hollow.Logical formLearned from6 sentences. A sky can be hollow.Logical formLearned from6 sentences. A mind can be hollow.Logical formLearned from6 sentences. A star can be hollow.Logical formLearned from6 sentences.