An input can be empty.Logical formLearned from44 sentences. A chair can be empty.Logical formLearned from44 sentences. A lobby can be empty.Logical formLearned from44 sentences. An account can be empty.Logical formLearned from43 sentences. A pistol can be empty.Logical formLearned from43 sentences. An empty bottle can be constituted-of-or-filled-with vodka.Logical formLearned from43 sentences. A basket can be empty.Logical formLearned from43 sentences. Flats can be empty.Logical formLearned from43 sentences. A van can be empty.Logical formLearned from43 sentences. (Parking spaces) can be empty.Logical formLearned from43 sentences. Magazines can be empty.Logical formLearned from43 sentences. (Milk cartons) can be empty.Logical formLearned from43 sentences. A pipe can be empty.Logical formLearned from43 sentences. (State coffers) can be empty.Logical formLearned from43 sentences. A backfield can be empty.Logical formLearned from43 sentences.