A probe can be hollow.Logical formLearned from10 sentences. A (glass tube) can be hollow.Logical formLearned from10 sentences. A hype can be hollow.Logical formLearned from10 sentences. An electrode can be hollow.Logical formLearned from10 sentences. Calls may ring hollow.Logical formLearned from10 sentences. An activity can be hollow.Logical formLearned from10 sentences. A (fiber system) can be hollow.Logical formLearned from10 sentences. Hairs can be hollow.Logical formLearned from10 sentences. An image can be hollow.Logical formLearned from10 sentences. A (square table) can be hollow.Logical formLearned from10 sentences. A (tree branch) can be hollow.Logical formLearned from10 sentences. An apology can be hollow.Logical formLearned from10 sentences. A tree can be hollow.Logical formLearned from10 sentences. Items can be hollow.Logical formLearned from9 sentences. A realm can be hollow.Logical formLearned from9 sentences.