(Practice settings) can be challenging.Logical formLearned from2 sentences. Cliffs can be challenging.Logical formLearned from2 sentences. (Mountain passes) can be challenging.Logical formLearned from2 sentences. A mess can be challenging.Logical formLearned from2 sentences. Conundrums can be challenging.Logical formLearned from2 sentences. Planning can be challenging.Logical formLearned from2 sentences. A new life can be challenging.Logical formLearned from2 sentences. Tutorials can be challenging.Logical formLearned from2 sentences. Interviews can be challenging.Logical formLearned from2 sentences. A musical language can be challenging.Logical formLearned from2 sentences. Adaptations can be challenging.Logical formLearned from2 sentences. A stockholder can be challenging.Logical formLearned from2 sentences. Careers can be challenging.Logical formLearned from2 sentences. A sonata can be challenging.Logical formLearned from2 sentences. (Recruit training) can be challenging.Logical formLearned from2 sentences.