Cooperation can be difficult.Logical formLearned from166 sentences. Cooperation can be between enterprises.Logical formLearned from165 sentences. Cooperation can be among governments.Logical formLearned from164 sentences. Cooperation can be with groups.Logical formLearned from164 sentences. Cooperation can be with other nations.Logical formLearned from164 sentences. Cooperation can be asian.Logical formLearned from163 sentences. Cooperation can be on an issue.Logical formLearned from163 sentences. Cooperation can be between authorities.Logical formLearned from162 sentences. Some sides may strengthen cooperation.Logical formLearned from161 sentences. Cooperation can be productive.Logical formLearned from161 sentences. Cooperation can be in fields of economy.Logical formLearned from161 sentences. Cooperation can be with universities.Logical formLearned from160 sentences. Cooperation can be on (security issues).Logical formLearned from159 sentences. Cooperation can be with inspectors.Logical formLearned from159 sentences. Cooperation can be with a military.Logical formLearned from158 sentences.