Protip: Don't practise marathon problems in pen.
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MS Paint supports 3 undos, so it's only so much better.
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which MS Paint? my MS Paint supports undoes as long as there's memory; i once undid about 40-50 steps
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Oh wat. labnol.org/software/ms-pa says it "supports 3-level of undos". I was referring more to mistakes than bifurcating though.
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