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You can't trace this graph without going twice over the same edge. In this graph four vertices have degrees 3 (odd) and one has degree 4 (even). In graphs traceable without lifting pencil off the paper and without going over the same edge twice all degrees must be even (enter and leave), and only two degrees can be odd (leave the starting vertex and enter the ending one). Hope this helps.

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Q: How do you trace an x in a box without going over same line twice?
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