A house can be challenging.Logical formLearned from3 sentences. Films can be challenging.Logical formLearned from3 sentences. Conditions may remain challenging.Logical formLearned from3 sentences. (Software development) may get challenging.Logical formLearned from3 sentences. A (travel market) can be challenging.Logical formLearned from3 sentences. Interpretation can be challenging.Logical formLearned from3 sentences. (Science questions) can be challenging.Logical formLearned from3 sentences. (Secondary schools) can be challenging.Logical formLearned from3 sentences. A country can be challenging.Logical formLearned from3 sentences. A (research question) can be challenging.Logical formLearned from3 sentences. (Drilling environments) can be challenging.Logical formLearned from3 sentences. Construction can be challenging.Logical formLearned from3 sentences. Interventions can be challenging.Logical formLearned from3 sentences. Topic can be challenging.Logical formLearned from3 sentences. Habitats can be challenging.Logical formLearned from3 sentences.