A hiking can be rugged.Logical formLearned from27 sentences. A land can be rugged.Logical formLearned from27 sentences. An appeal can be rugged.Logical formLearned from27 sentences. A portion can be rugged.Logical formLearned from27 sentences. A system can be rugged.Logical formLearned from27 sentences. An unit can be rugged.Logical formLearned from27 sentences. A camera can be rugged.Logical formLearned from27 sentences. Hillsides can be rugged.Logical formLearned from27 sentences. A route can be rugged.Logical formLearned from27 sentences. An adventurer can be rugged.Logical formLearned from27 sentences. A countenance can be rugged.Logical formLearned from26 sentences. A hillside can be rugged.Logical formLearned from26 sentences. A simplicity can be rugged.Logical formLearned from26 sentences. Paths can be rugged.Logical formLearned from26 sentences. A (jungle terrain) can be rugged.Logical formLearned from25 sentences.