A cover can be gray.Logical formLearned from31 sentences. Populations can be gray.Logical formLearned from31 sentences. A gray line can be thin.Logical formLearned from31 sentences. A male may go gray.Logical formLearned from31 sentences. Gray eyes can be blue.Logical formLearned from31 sentences. Legs can be gray.Logical formLearned from31 sentences. Kittens can be gray.Logical formLearned from31 sentences. Boulders can be gray.Logical formLearned from31 sentences. Towers can be gray.Logical formLearned from31 sentences. A smog can be gray.Logical formLearned from31 sentences. A ball can be gray.Logical formLearned from31 sentences. A glass can be gray.Logical formLearned from30 sentences. Dark can be gray.Logical formLearned from30 sentences. Branches can be gray.Logical formLearned from30 sentences. A wash can be gray.Logical formLearned from30 sentences.