Work of persons can be hard.Logical formLearned from17 sentences. An effort can be hard.Logical formLearned from17 sentences. A comebacker can be hard.Logical formLearned from17 sentences. A day may try hard.Logical formLearned from17 sentences. A (winter wheat belt) can be hard.Logical formLearned from17 sentences. A person may be sentenced to some years of hard labor.Logical formLearned from17 sentences. An estimate can be hard.Logical formLearned from17 sentences. A (coal production) can be hard.Logical formLearned from17 sentences. A hard core can be constituted-of-or-filled-with activists.Logical formLearned from17 sentences. A compromise can be hard.Logical formLearned from17 sentences. Rugby can be hard.Logical formLearned from17 sentences. A chine can be hard.Logical formLearned from16 sentences. A plaster can be hard.Logical formLearned from16 sentences. An outfit can be hard.Logical formLearned from16 sentences. A (tennis tournament) may be played on hard courts.Logical formLearned from16 sentences.