Substances can be hard.Logical formLearned from38 sentences. A shell can be hard.Logical formLearned from38 sentences. Hard times may be hited.Logical formLearned from38 sentences. A change can be hard.Logical formLearned from38 sentences. A hard disk may fail.Logical formLearned from38 sentences. An error can be hard.Logical formLearned from38 sentences. A suck can be hard.Logical formLearned from38 sentences. A luggage can be hard.Logical formLearned from38 sentences. Men can be in hard hats.Logical formLearned from38 sentences. A shot can be hard.Logical formLearned from38 sentences. A thump can be hard.Logical formLearned from38 sentences. Content may be stored on a hard drive.Logical formLearned from38 sentences. A cock may get hard.Logical formLearned from38 sentences. Hard hats can be white.Logical formLearned from38 sentences. A (tile floor) can be hard.Logical formLearned from38 sentences.