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    July 30

    sicp 3.14

    先看一下loop都做了什么,它把第一个列的开头部分和第二个列重新组合,然后对第一列余下的部分和新组合得的列再次应用loop。
    不难看出mystery实际上返回的是一个列的逆序列,但该过程的side effect值得注意,它把原先的x的“尾巴”全部截掉了!

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