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Long time ago I failed to solve this conjecture. Nice to see it have been solved. I shared some email with S. Hetdetniemi about some special cases. Good old times.

What results and special cases did you work on?

I cannot remember. I emailed him about some results, he said they were interesting, but later I discovered those results were already published. I told him : I will throw them to trash. Very impolite from my part!, that must be 20 years ago.

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