A problem can be famous.Logical formLearned from190 sentences. Problems may appear.Logical formLearned from190 sentences. Traffic can be a problem.Logical formLearned from190 sentences. Problems can be between some countries.Logical formLearned from189 sentences. A problem may appear.Logical formLearned from189 sentences. A list may pertain-to problems.Logical formLearned from189 sentences. A root of a problem can be that something-is-the-case.Logical formLearned from189 sentences. A problem can be technological.Logical formLearned from188 sentences. A person can be aware of a problem.Logical formLearned from188 sentences. Problems may pertain-to a system.Logical formLearned from188 sentences. A problem can be over.Logical formLearned from188 sentences. A problem can be costly.Logical formLearned from188 sentences. A person may have back problems.Logical formLearned from188 sentences. Economic problems can be in a country.Logical formLearned from187 sentences. A problem can be with persons.Logical formLearned from187 sentences.