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Edit history of sicp-ex-4.4

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32014-07-09 03:13:15+8 -2 line(s)[View this version, source] [Diff to previous]
Small correction to meteorgan's answer. And discussion about the use of sequence->exp to avoid and error if we have more than 1 action.
22012-09-14 09:33:39+35 -0 line(s)[View this version, source] [Diff to current|previous]
a cleaner solution for derived form
12012-07-24 15:16:25+67 -0 line(s)[View this version, source] [Diff to current|previous]
add answer
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