Numbers can be empty.Logical formLearned from12 sentences. External (fuel tanks) can be empty.Logical formLearned from12 sentences. A public park can be empty.Logical formLearned from12 sentences. (Inland barrens) can be empty.Logical formLearned from12 sentences. A (company box) can be empty.Logical formLearned from12 sentences. A shot can be empty.Logical formLearned from12 sentences. Skins can be empty.Logical formLearned from12 sentences. Square brackets can be empty.Logical formLearned from12 sentences. Some buildings may sit empty.Logical formLearned from12 sentences. A courthouse can be empty.Logical formLearned from12 sentences. A (plastic water bottle) can be empty.Logical formLearned from12 sentences. (Propane tanks) can be empty.Logical formLearned from12 sentences. Cases can be empty.Logical formLearned from12 sentences. A religion can be empty.Logical formLearned from12 sentences. A (string buffer) can be empty.Logical formLearned from12 sentences.