Description: Ary to achieve 10000 (0000 ~ 9999) plus/minus count, S1 for the summand button, every time S1, count 1, when the count to 9999, when, and then S1 will reset button 0000 S2 subtrahend keys for each by an S2, counting by 1, when the count to 0000, and then S2 keys are home for 9999.
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