A background can be empty.Logical formLearned from18 sentences. A node can be empty.Logical formLearned from18 sentences. Transports can be empty.Logical formLearned from18 sentences. A fifth can be empty.Logical formLearned from18 sentences. A faith can be empty.Logical formLearned from18 sentences. A farmland can be empty.Logical formLearned from18 sentences. An implementation can be empty.Logical formLearned from18 sentences. A drive can be empty.Logical formLearned from18 sentences. A carriage can be empty.Logical formLearned from18 sentences. A (hospital room) can be empty.Logical formLearned from18 sentences. A driveway can be empty.Logical formLearned from18 sentences. (Shampoo bottles) can be empty.Logical formLearned from18 sentences. A deck can be empty.Logical formLearned from18 sentences. Desks can be empty.Logical formLearned from18 sentences. Fairgrounds can be empty.Logical formLearned from18 sentences.