Modules can be empty.Logical formLearned from17 sentences. A (result set) can be empty.Logical formLearned from17 sentences. Loops can be empty.Logical formLearned from17 sentences. A cell can be empty.Logical formLearned from17 sentences. A minibuffer can be empty.Logical formLearned from17 sentences. Rolls can be empty.Logical formLearned from17 sentences. Nodes can be empty.Logical formLearned from17 sentences. A button can be empty.Logical formLearned from17 sentences. A (parameter list) can be empty.Logical formLearned from17 sentences. A cylinder can be empty.Logical formLearned from17 sentences. Coaches can be empty.Logical formLearned from17 sentences. A factory can be empty.Logical formLearned from17 sentences. Streets can be empty of vehicles.Logical formLearned from17 sentences. A (mayonnaise jar) can be empty.Logical formLearned from17 sentences. A strategy can be empty.Logical formLearned from17 sentences.