Cliffs can be unstable.Logical formLearned from21 sentences. Cliffs can be gray.Logical formLearned from21 sentences. A cliff can be green.Logical formLearned from20 sentences. Cliffs can be barren.Logical formLearned from20 sentences. A (cliff hanger) can be biennial.Logical formLearned from20 sentences. A (cliff hanger) may be created.Logical formLearned from20 sentences. A cliff can be on a side.Logical formLearned from20 sentences. Persons may fall off a cliff.Logical formLearned from20 sentences. Views may show cliffs.Logical formLearned from20 sentences. Cliffs can be high.Logical formLearned from20 sentences. A portion may pertain-to a cliff.Logical formLearned from20 sentences. Houses may be perched on red cliffs.Logical formLearned from20 sentences. Cliffs can be scenic.Logical formLearned from19 sentences. A person can be on a cliff.Logical formLearned from19 sentences. A shantytown may grow in a shadow of a cliff.Logical formLearned from19 sentences.