每个个体从a点开始，并且其适应性为1，然后个体可以根据它与b点的接近程度来增加它的适应性。命令“U”、“D”、“L”或“R”分别代表上移、下移、左移或右移。
Every individual starts with fitness 1 at point a and can raise its fitness based on how close it gets to point B. Every command "u", "d", "l", or "r" moves up, down, left, or right, respectively.
为将一个文件备份还原到其原始位置，只需在根处键入以下命令即可
To restore a file backup to its original location, simply key in the following command from root
frame 命令创建了一个称为 .rc 的窗口，其边界宽度为 2 个像素。
The frame command creates a window called .rc with a borderwidth of two pixels.
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