A treefrog can be gray.Logical formLearned from19 sentences. A river can be gray.Logical formLearned from19 sentences. An upholstery can be gray.Logical formLearned from19 sentences. A font can be gray.Logical formLearned from19 sentences. Gray wolves may undergo a population.Logical formLearned from19 sentences. Surfaces can be gray.Logical formLearned from19 sentences. A window can be gray.Logical formLearned from19 sentences. Gray eyes can be steely.Logical formLearned from19 sentences. A plaid can be gray.Logical formLearned from19 sentences. A ribbon can be gray.Logical formLearned from19 sentences. A road can be gray.Logical formLearned from19 sentences. A marker can be gray.Logical formLearned from19 sentences. A gray market can be unfledged.Logical formLearned from19 sentences. A tinge can be gray.Logical formLearned from19 sentences. A picture can be gray.Logical formLearned from19 sentences.