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    to find all the possible safe position is helpful.

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    There is a special algorithm:
    look at c, c is not auto-opened, so c is not 0. that means, there is at least 1 mine around c(or c is a mine).
    So, 1 mine hide between a,d, 1 mine hide between j,l, 1 mine hide between bcef
    g,h,i,k,m are the safe positions, open them, and continue your work ;-)