A terrain can be rugged.Logical formLearned from4 384 sentences. A region can be rugged.Logical formLearned from1 437 sentences. An area can be rugged.Logical formLearned from1 045 sentences. A border can be rugged.Logical formLearned from890 sentences. Hills can be rugged.Logical formLearned from724 sentences. A landscape can be rugged.Logical formLearned from651 sentences. Mountains can be rugged.Logical formLearned from502 sentences. A coast can be rugged.Logical formLearned from482 sentences. A country can be rugged.Logical formLearned from450 sentences. A coastline can be rugged.Logical formLearned from434 sentences. Construction can be rugged.Logical formLearned from340 sentences. A beauty can be rugged.Logical formLearned from320 sentences. Areas can be rugged.Logical formLearned from301 sentences. A frontier can be rugged.Logical formLearned from288 sentences. A land can be rugged.Logical formLearned from284 sentences.