A definition can be difficult.Logical formLearned from13 sentences. A (selling environment) can be difficult.Logical formLearned from13 sentences. A (cheerleading squad) can be difficult.Logical formLearned from13 sentences. A battle can be difficult.Logical formLearned from13 sentences. (Spending cuts) can be difficult.Logical formLearned from13 sentences. Pictures can be difficult.Logical formLearned from13 sentences. Scrutiny can be difficult.Logical formLearned from13 sentences. Acquisitions can be difficult.Logical formLearned from13 sentences. A stunt can be difficult.Logical formLearned from13 sentences. Mazes can be difficult.Logical formLearned from13 sentences. A dog can be difficult.Logical formLearned from13 sentences. An improvement can be difficult.Logical formLearned from13 sentences. A literary-work can be difficult.Logical formLearned from13 sentences. Cycling can be difficult.Logical formLearned from13 sentences. An adventure can be difficult.Logical formLearned from13 sentences.