Students may find difficult.Logical formLearned from38 sentences. A marketplace can be difficult.Logical formLearned from38 sentences. A summit can be difficult.Logical formLearned from38 sentences. A level can be difficult.Logical formLearned from38 sentences. A war can be difficult.Logical formLearned from38 sentences. (Peace negotiations) can be difficult.Logical formLearned from38 sentences. Opposition can be difficult.Logical formLearned from38 sentences. A course can be difficult.Logical formLearned from38 sentences. Crossroads can be difficult.Logical formLearned from37 sentences. A pitch can be difficult.Logical formLearned from37 sentences. Fund-raising can be difficult.Logical formLearned from37 sentences. Deliveries can be difficult.Logical formLearned from37 sentences. Operations can be difficult.Logical formLearned from37 sentences. A hunt can be difficult.Logical formLearned from37 sentences. A topic can be difficult.Logical formLearned from37 sentences.