Transparent plastics can be hard.Logical formLearned from18 sentences. Space can be hard.Logical formLearned from18 sentences. A hard top can be black.Logical formLearned from18 sentences. Perfection can be hard.Logical formLearned from18 sentences. Persons can be in hard times.Logical formLearned from18 sentences. A person can be hard on a male.Logical formLearned from18 sentences. A guy may work hard.Logical formLearned from18 sentences. A wind may blow hard.Logical formLearned from18 sentences. A belly can be hard.Logical formLearned from18 sentences. Lines can be hard.Logical formLearned from18 sentences. Workers may remove hard hats.Logical formLearned from18 sentences. A (job performance) can be hard.Logical formLearned from18 sentences. A male may have hard evidence.Logical formLearned from18 sentences. A hard rain can be cold.Logical formLearned from18 sentences. A sheep can be hard.Logical formLearned from18 sentences.