A formation can be rugged.Logical formLearned from4 sentences. A far side can be rugged.Logical formLearned from4 sentences. A rise can be rugged.Logical formLearned from4 sentences. Land can be rugged.Logical formLearned from4 sentences. A (transport case) can be rugged.Logical formLearned from4 sentences. A terrain may consist of rugged mountains.Logical formLearned from4 sentences. Gloves can be rugged.Logical formLearned from4 sentences. Garments can be rugged.Logical formLearned from4 sentences. Sensors can be rugged.Logical formLearned from4 sentences. Ascents can be rugged.Logical formLearned from4 sentences. A moorland can be rugged.Logical formLearned from4 sentences. (Granite cliffs) can be rugged.Logical formLearned from4 sentences. (Computing systems) can be rugged.Logical formLearned from4 sentences. Spurs can be rugged.Logical formLearned from4 sentences. A (vacuum tube) can be rugged.Logical formLearned from4 sentences.