Chairs can be hard.Logical formLearned from131 sentences. Steel can be hard.Logical formLearned from131 sentences. A person may fall on hard times.Logical formLearned from130 sentences. A hard drive can be removable.Logical formLearned from130 sentences. Constraints can be hard.Logical formLearned from130 sentences. An impact can be hard.Logical formLearned from130 sentences. An impact can be hard.Logical formLearned from129 sentences. A competition can be hard.Logical formLearned from129 sentences. A story can be hard.Logical formLearned from129 sentences. Strokes can be hard.Logical formLearned from129 sentences. A period can be hard.Logical formLearned from129 sentences. A hard drive can be detachable.Logical formLearned from129 sentences. A check can be hard.Logical formLearned from129 sentences. A working man can be hard.Logical formLearned from128 sentences. Classes can be hard.Logical formLearned from128 sentences.