A problem can be age-old.Logical formLearned from538 sentences. Problems can be nutritional.Logical formLearned from537 sentences. A problem may undergo an analysis.Logical formLearned from534 sentences. A problem can be with an argument.Logical formLearned from532 sentences. Potential can be for problems.Logical formLearned from528 sentences. A person may see problems.Logical formLearned from528 sentences. A problem can be difficult.Logical formLearned from527 sentences. A problem may pertain-to the world.Logical formLearned from526 sentences. Problems may undergo a discussion.Logical formLearned from525 sentences. Someone may have a problem.Logical formLearned from522 sentences. Signs can be constituted-of-or-filled-with problems.Logical formLearned from521 sentences. Problems can be circulatory.Logical formLearned from517 sentences. A problem can be annoying.Logical formLearned from517 sentences. A problem may pertain-to a company.Logical formLearned from517 sentences. A problem can be complex.Logical formLearned from515 sentences.