差三错四

Explanation: Reverse confusion 　　Usage: Joint type; as predicate, adverbial; that reverse confusion 　　Source: Yuan Anonymous "contract language," the fourth off: "This servant of the small one does this say two, this poor Old Woman Three mistakes students make four twisted." 　　Examples: This servant, said the small one does the second, this Old Woman Health and twisted to do ~. ("Yuan election CONTRACT") Thesaurus:  forgetful, Losing things