Culms can be hollow.Logical formLearned from2 sentences. A helmet can be hollow.Logical formLearned from2 sentences. A (body organ) can be hollow.Logical formLearned from2 sentences. A caisson can be hollow.Logical formLearned from2 sentences. A (log coffin) can be hollow.Logical formLearned from2 sentences. A medallion can be hollow.Logical formLearned from2 sentences. Struts can be hollow.Logical formLearned from2 sentences. A .... can be hollow.Logical formLearned from2 sentences. Elements can be hollow.Logical formLearned from2 sentences. A cup may be shaped hollow.Logical formLearned from2 sentences. Trunks can be hollow.Logical formLearned from2 sentences. Nanofibres can be hollow.Logical formLearned from2 sentences. (Piston valves) can be hollow.Logical formLearned from2 sentences. (Wine cellars) can be hollow.Logical formLearned from2 sentences. (Counterpoint vocals) can be hollow.Logical formLearned from2 sentences.