A hard case can be black.Logical formLearned from29 sentences. A piece can be hard.Logical formLearned from29 sentences. An exam can be hard.Logical formLearned from29 sentences. A bike can be hard.Logical formLearned from29 sentences. A semester can be hard.Logical formLearned from29 sentences. Hard drives may crash.Logical formLearned from29 sentences. Details can be hard.Logical formLearned from29 sentences. A US-president may take a hard line.Logical formLearned from29 sentences. A section can be hard.Logical formLearned from29 sentences. A family can be hard.Logical formLearned from29 sentences. A person may put_in a lot of hard work.Logical formLearned from29 sentences. A rule can be hard.Logical formLearned from29 sentences. A basis can be hard.Logical formLearned from29 sentences. A team may play hard.Logical formLearned from29 sentences. The weather can be hard.Logical formLearned from29 sentences.