The user can increase and decrease the number by clicking up and down buttons, by pressing the UP and DOWN ARROW keys, or by typing a number.

使用者可以按一下向上和向下按钮、按向上键和向下键或输入数字来递增或递减数值。

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Now you realize there is no taboo in his mind. Rule number one, three buttons loosen up minimum.

通行的规则只有两条 ：首先，至少解开三粒扣子；

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