Skyscrapers can be empty.Logical formLearned from10 sentences. Concepts can be empty.Logical formLearned from10 sentences. Trucks can be empty.Logical formLearned from10 sentences. A (trash command) can be empty.Logical formLearned from10 sentences. A (convention center) can be empty.Logical formLearned from10 sentences. Some cells can be empty.Logical formLearned from10 sentences. Hills can be empty.Logical formLearned from10 sentences. A (selector string) can be an empty string.Logical formLearned from10 sentences. A (character sequence) can be empty.Logical formLearned from10 sentences. A parlor can be empty.Logical formLearned from10 sentences. A model can be empty.Logical formLearned from10 sentences. A text can be empty.Logical formLearned from10 sentences. A desolation can be empty.Logical formLearned from10 sentences. Formalities can be empty.Logical formLearned from10 sentences. A vine can be empty.Logical formLearned from10 sentences.