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Edit history of sicp-ex-4.42

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42013-09-15 03:47:27+36 -69 line(s)[View this version, source] [Diff to previous]
better code
32013-09-15 03:26:34+136 -0 line(s)[View this version, source] [Diff to current|previous]
another solution
22012-08-03 13:34:34+2 -2 line(s)[View this version, source] [Diff to current|previous]
fixed index
12012-08-03 13:34:06+26 -0 line(s)[View this version, source] [Diff to current|previous]
add answer
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