Hi again Paul,

I have now had a long look on your workbook and I don't understand all of your code in mod_PH1.

However, I think that I understand your output.

You are taking "CityX+MetricM minus CityY+MetricM " to avoid duplicates?

I don't understand what you mean with +1 or 0 and NOT +1 and -1?

Thank you again for your help with this!

EDIT: I am not sure but I think that it is the best way to start with "Score" as input?