Internodes can be hollow.Logical formLearned from4 sentences. Extrusions can be hollow.Logical formLearned from4 sentences. A (charge warhead) can be hollow.Logical formLearned from4 sentences. Tentacles can be hollow.Logical formLearned from4 sentences. A run can be hollow.Logical formLearned from4 sentences. (Air spaces) can be hollow.Logical formLearned from4 sentences. An (earth land) can be hollow.Logical formLearned from4 sentences. A weed can be hollow.Logical formLearned from4 sentences. Tendrils can be hollow.Logical formLearned from4 sentences. A team can be hollow.Logical formLearned from4 sentences. Tree-trunks can be hollow.Logical formLearned from4 sentences. (Rubber balls) can be hollow.Logical formLearned from4 sentences. Tomatoes can be hollow.Logical formLearned from4 sentences. Spines can be hollow.Logical formLearned from4 sentences. An arrow can be hollow.Logical formLearned from4 sentences.