What are the idioms with the same structure as "secret"?

Mimi is an idiom in which the first word is the same as the second word, the third word is the same as the fourth word, and the first two words are different from the last two words. Similar words are:

Intermittent, serious, big and small, core, more or less, evasive, careless, generous, trembling, killing, every household, in a hurry, conscientious, stuttering, in and out, healthy, chattering, slow, endless, so-so, clear, busy.