Cats can be difficult.Logical formLearned from9 sentences. (Balancing acts) can be difficult.Logical formLearned from9 sentences. An (application process) can be difficult.Logical formLearned from9 sentences. An infrastructure can be difficult.Logical formLearned from9 sentences. A format can be difficult.Logical formLearned from9 sentences. A north market can be difficult.Logical formLearned from9 sentences. Equipment can be difficult.Logical formLearned from9 sentences. Objectives can be difficult.Logical formLearned from9 sentences. Jumps can be difficult.Logical formLearned from9 sentences. A struggle can be difficult.Logical formLearned from9 sentences. Assignments can be difficult.Logical formLearned from9 sentences. A first couple of years can be difficult.Logical formLearned from9 sentences. A hiking can be difficult.Logical formLearned from9 sentences. A third album can be difficult.Logical formLearned from9 sentences. A criticism can be difficult.Logical formLearned from9 sentences.