A tree can be empty.Logical formLearned from13 sentences. A sac can be empty.Logical formLearned from13 sentences. Epithets can be empty.Logical formLearned from13 sentences. (Market stalls) can be empty.Logical formLearned from13 sentences. A (sugar bowl) can be empty.Logical formLearned from13 sentences. A (food dish) can be empty.Logical formLearned from13 sentences. Cells can be empty.Logical formLearned from13 sentences. An enclosure can be empty.Logical formLearned from13 sentences. A pander can be empty.Logical formLearned from13 sentences. A cooler can be empty.Logical formLearned from13 sentences. Guns can be empty.Logical formLearned from13 sentences. Miles can be empty.Logical formLearned from13 sentences. Flights can be empty.Logical formLearned from13 sentences. (Airline seats) can be empty.Logical formLearned from13 sentences. A black hole can be empty.Logical formLearned from13 sentences.