A struggle can be tough.Logical formLearned from19 sentences. Technical problems can be tough.Logical formLearned from18 sentences. Bargains can be tough.Logical formLearned from18 sentences. A (confirmation hearing) can be tough.Logical formLearned from18 sentences. Duties can be tough.Logical formLearned from18 sentences. A tournament can be tough.Logical formLearned from18 sentences. Events can be tough.Logical formLearned from18 sentences. A rock can be tough.Logical formLearned from18 sentences. (Government regulations) can be tough.Logical formLearned from18 sentences. Survivors can be tough.Logical formLearned from18 sentences. A control can be tough.Logical formLearned from18 sentences. Creatures can be tough.Logical formLearned from18 sentences. Classes can be tough.Logical formLearned from18 sentences. Days can be tough.Logical formLearned from18 sentences. Emotions can be tough.Logical formLearned from18 sentences.