A (sycamore tree) can be hollow.Logical formLearned from2 sentences. Nanotubes can be hollow.Logical formLearned from2 sentences. A driblet can be hollow.Logical formLearned from2 sentences. A (style obelisk) can be hollow.Logical formLearned from2 sentences. A (bell tower) can be hollow.Logical formLearned from2 sentences. An ach can be hollow.Logical formLearned from2 sentences. Acts can be hollow.Logical formLearned from2 sentences. A last man can be hollow.Logical formLearned from2 sentences. A wait may pertain-to a hollow man.Logical formLearned from2 sentences. An affirmation can be hollow.Logical formLearned from2 sentences. Persons can be hollow at a core.Logical formLearned from2 sentences. A dark can be hollow.Logical formLearned from2 sentences. A lichen can be hollow.Logical formLearned from2 sentences. An (intercom voice) can be hollow.Logical formLearned from2 sentences. A (brick type) can be hollow.Logical formLearned from2 sentences.