Citizens may pertain-to an union.Logical formLearned from13 sentences. An union may pertain-to a US-president.Logical formLearned from13 sentences. Unions can be voluntary.Logical formLearned from13 sentences. An union may seek a (wage increase).Logical formLearned from13 sentences. Pilots may be encouraged by (union leaders).Logical formLearned from13 sentences. A drive can be toward political union.Logical formLearned from13 sentences. Unions may represent public employees.Logical formLearned from13 sentences. Unions may call_off a strike.Logical formLearned from13 sentences. An union may pertain-to a pressmen.Logical formLearned from13 sentences. Some state can be in an union.Logical formLearned from13 sentences. A (business manager) may pertain-to an union.Logical formLearned from13 sentences. Unions can be on strike.Logical formLearned from13 sentences. An effort can be by unions.Logical formLearned from13 sentences. An union may signal that something-is-the-case.Logical formLearned from13 sentences. An union may raise concerns.Logical formLearned from13 sentences.