Classes can be hard.Logical formLearned from63 sentences. Practices can be hard.Logical formLearned from63 sentences. An answer can be hard.Logical formLearned from63 sentences. A shift can be hard.Logical formLearned from63 sentences. A shake can be hard.Logical formLearned from63 sentences. Errors can be hard.Logical formLearned from63 sentences. A shortage can be constituted-of-or-filled-with hard currency.Logical formLearned from63 sentences. A hard hat can be white.Logical formLearned from63 sentences. A person may believe in hard work.Logical formLearned from63 sentences. A think can be hard.Logical formLearned from63 sentences. A person may fight hard.Logical formLearned from63 sentences. A paper can be hard.Logical formLearned from62 sentences. A reputation can be for hard work.Logical formLearned from62 sentences. A change can be hard.Logical formLearned from62 sentences. Rods can be hard.Logical formLearned from62 sentences.