A period can be rugged.Logical formLearned from9 sentences. A competition can be rugged.Logical formLearned from9 sentences. Demands can be rugged.Logical formLearned from9 sentences. A stainless steel can be rugged.Logical formLearned from9 sentences. A footwear can be rugged.Logical formLearned from9 sentences. A fighter can be rugged.Logical formLearned from9 sentences. A (mountain nation) can be rugged.Logical formLearned from9 sentences. A group can be from rugged mountains.Logical formLearned from9 sentences. Districts can be rugged.Logical formLearned from9 sentences. A barrier can be constituted-of-or-filled-with rugged mountains.Logical formLearned from9 sentences. A wing can be rugged.Logical formLearned from9 sentences. A (mountain pass) can be rugged.Logical formLearned from9 sentences. A territory can be rugged.Logical formLearned from9 sentences. A belt can be rugged.Logical formLearned from9 sentences. A northwest region can be rugged.Logical formLearned from9 sentences.