A highway can be rugged.Logical formLearned from10 sentences. A range can be constituted-of-or-filled-with rugged mountains.Logical formLearned from10 sentences. Leaders can be in rugged mountains.Logical formLearned from10 sentences. Zones can be rugged.Logical formLearned from10 sentences. Hardware can be rugged.Logical formLearned from10 sentences. A bush can be rugged.Logical formLearned from10 sentences. Provinces can be rugged.Logical formLearned from10 sentences. A (mountain border) can be rugged.Logical formLearned from9 sentences. (Mountain valleys) can be rugged.Logical formLearned from9 sentences. A habitat can be rugged.Logical formLearned from9 sentences. A massif can be rugged.Logical formLearned from9 sentences. An aluminum can be rugged.Logical formLearned from9 sentences. A young man can be rugged.Logical formLearned from9 sentences. Shorelines can be rugged.Logical formLearned from9 sentences. A descent can be rugged.Logical formLearned from9 sentences.