Comparatives can be challenging.Logical formLearned from4 sentences. A (language barrier) can be challenging.Logical formLearned from4 sentences. A (gas market) can be challenging.Logical formLearned from4 sentences. A strait can be challenging.Logical formLearned from4 sentences. A report can be challenging.Logical formLearned from4 sentences. Times may remain challenging.Logical formLearned from4 sentences. The future may remain challenging.Logical formLearned from4 sentences. An environment may get challenging.Logical formLearned from4 sentences. Some acquisitions may proven challenging.Logical formLearned from4 sentences. Exchanges can be challenging.Logical formLearned from4 sentences. A detention can be challenging.Logical formLearned from4 sentences. A (dollar shortage) can be challenging.Logical formLearned from4 sentences. Races can be challenging.Logical formLearned from4 sentences. Rapids can be challenging.Logical formLearned from4 sentences. An (advertising environment) can be challenging.Logical formLearned from4 sentences.