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be (as) easy as one-two-three
To be extremely easy, simple, or intuitive; to require very little skill or effort. (Sometimes used with the numbers spelled out ("one-two-three") or written numerically ("123" or "1-2-3").) After so many years as an accountant, doing taxes is as easy as one-two-three for me.Boy, that test was easy as 1-2-3!