Correct: part and parcel, now or never, once and for all, prim and proper, here and there, peace and quiet, rest and recreation, on and off, sooner or later, odds and ends, clean and tidy, all or nothing, safe and sound, law and order, Incorrect: back and front, part and choose, prim or proper, peace but war, rest and sound, quiet and about, pick and rose, sooner or nothing, down or out, lips and bones,

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