Corporations can be challenging.Logical formLearned from4 sentences. A job may get challenging.Logical formLearned from4 sentences. A puzzle can be challenging.Logical formLearned from4 sentences. (Life lessons) can be challenging.Logical formLearned from4 sentences. A baby can be challenging.Logical formLearned from4 sentences. A challenge can be challenging.Logical formLearned from4 sentences. Integration can be challenging.Logical formLearned from4 sentences. A (military mission) can be challenging.Logical formLearned from4 sentences. Gameplay can be challenging.Logical formLearned from4 sentences. A (skin condition) can be challenging.Logical formLearned from4 sentences. (Health care issues) can be challenging.Logical formLearned from4 sentences. Tests can be challenging.Logical formLearned from4 sentences. Teens can be challenging.Logical formLearned from4 sentences. Units can be challenging.Logical formLearned from4 sentences. A lab can be challenging.Logical formLearned from4 sentences.