

Example 
Target
 Click to enlarge 
The example is colored on its edges with five colors. There are 12
closed paths of length 5 in the example: all of them have one edge of
each color. The target has 20 closed paths of length 5. Your
problem: make a similar coloring in five colors so that all 20 closed
paths of length 5 use all five colors.
Send your answer to mathstat@uoguelph.ca
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