When I started merging, I did merging three times across this whole board, this level, this level, and this level, and each time because of the way I was advancing my fingers I touched each number just once.
在整个过程中,我一共做了,三次合并,这一层,这一层,和这一层,而且每次,由于要前移手指,因此对每个数字,仅仅移动了一次。
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