Lichens can be gray.Logical formLearned from13 sentences. (Iron castings) can be gray.Logical formLearned from13 sentences. (Metal filing cabinets) can be gray.Logical formLearned from13 sentences. A possession can be gray.Logical formLearned from13 sentences. Gray eyes can be pale.Logical formLearned from13 sentences. Gray areas can be in a law.Logical formLearned from13 sentences. Sleeves can be gray.Logical formLearned from13 sentences. A helicopter can be gray.Logical formLearned from13 sentences. A pile can be gray.Logical formLearned from13 sentences. A vessel can be gray.Logical formLearned from13 sentences. Jerseys can be gray.Logical formLearned from13 sentences. A monument can be gray.Logical formLearned from13 sentences. A cold can be gray.Logical formLearned from13 sentences. A life can be gray.Logical formLearned from13 sentences. A (trouser suit) can be gray.Logical formLearned from13 sentences.