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The simplest approach, I think, will be using two stacked gears on a single shaft - one with 2/3 of its teeth missing, one with 1/3 of them missing. The gear with 1/3 gears missing engages to output gear (2/3 of the time) through two gears, the one with 1/3 missing - through one gear, spinning freely while the other one is engaged and vice versa. This way ...

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