(Mountain slopes) can be rugged.Logical formLearned from33 sentences. A rock can be rugged.Logical formLearned from32 sentences. A natural beauty can be rugged.Logical formLearned from32 sentences. A version can be rugged.Logical formLearned from32 sentences. A (computer manufacturer) can be rugged.Logical formLearned from32 sentences. Places can be rugged.Logical formLearned from32 sentences. Ridges can be rugged.Logical formLearned from32 sentences. A midfielder can be rugged.Logical formLearned from32 sentences. A number can be rugged.Logical formLearned from31 sentences. An individuality can be rugged.Logical formLearned from31 sentences. Mountains can be rugged.Logical formLearned from31 sentences. A site can be rugged.Logical formLearned from31 sentences. An outdoorsman can be rugged.Logical formLearned from30 sentences. Borders can be rugged.Logical formLearned from30 sentences. (Denim minis) can be rugged.Logical formLearned from29 sentences.