A jail can be empty.Logical formLearned from14 sentences. Sites can be empty.Logical formLearned from14 sentences. (Campaign promises) can be empty.Logical formLearned from14 sentences. Mementoes can be empty.Logical formLearned from14 sentences. Waters can be empty.Logical formLearned from14 sentences. A nursery can be empty.Logical formLearned from14 sentences. A post may be left empty.Logical formLearned from14 sentences. Buildings may remain empty.Logical formLearned from14 sentences. A country can be empty of arms of mass destruction.Logical formLearned from14 sentences. A launcher can be empty.Logical formLearned from14 sentences. Places can be empty.Logical formLearned from14 sentences. An (apartment building) can be empty.Logical formLearned from14 sentences. A warhead can be empty.Logical formLearned from13 sentences. An appearance can be empty.Logical formLearned from13 sentences. Seeds can be empty.Logical formLearned from13 sentences.