A limestone can be rugged.Logical formLearned from6 sentences. An engine can be rugged.Logical formLearned from6 sentences. Trees can be rugged.Logical formLearned from6 sentences. Elements can be rugged.Logical formLearned from6 sentences. A floor can be rugged.Logical formLearned from6 sentences. A robot can be rugged.Logical formLearned from6 sentences. An area can be rugged.Logical formLearned from6 sentences. (Sea cliffs) can be rugged.Logical formLearned from6 sentences. Objects can be rugged.Logical formLearned from6 sentences. A vehicle can be rugged.Logical formLearned from6 sentences. Rugged mountains may run.Logical formLearned from6 sentences. Volcanic mountains can be rugged.Logical formLearned from6 sentences. Tablelands can be rugged.Logical formLearned from6 sentences. A precipice can be rugged.Logical formLearned from6 sentences. A height can be rugged.Logical formLearned from6 sentences.