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December 15, 2015 13:38
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| def enum(sofar, new): | |
| if len(new) == 0: | |
| return sofar | |
| else: | |
| return enum (sofar + new[0] + 'r', new[1:]) \ | |
| + enum (sofar + new[0] + 'g', new[1:]) \ | |
| + enum (sofar + new[0] + 'b', new[1:]) \ |
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