7(-4)3,4(-4)0

Start

3(-3)0,turn 4(-3)1, +3

Turn 7(-3)4,turn 3(-3)0, +3

Turn 3(-3)0,0(no operation)0, +3

So

3+3+3=9

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Discussion

不知道我这种写法,别人能否看得懂。