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Many thanks for this explanation.

I see better what is the issue unique caches means implicitely a list to do.

I discussed with the rewiever...and as expected, he said this case is not simple and he couldn't say if it was acceptable or not, so your analysis was perfect!
After some mails, we finally converged to the following solution that respect well the guidelines:

--> To have found at least 6 different types of cache within a 50km radius from the challenge location (coordinates : N 43° 33.896 E 001° 20.326).

I think it is okay for creating the challenge checker :)

Thanks by advance

Jean-Paul

[Edit ] I changed the title of the answer.

Many thanks for this explanation.

I see better what is the issue unique caches means implicitely a list to do.

I discussed with the rewiever...and as expected, he said this case is not simple and he couldn't say if it was acceptable or not, so your analysis was perfect!
After some mails, we finally converged to the following solution that respect well the guidelines:

--> To have found at least 6 different types of cache within a 50km radius from the challenge location (coordinates : N 43° 33.896 E 001° 20.326).

I think it is okay for creating the challenge checker :)

Thanks by advance

Jean-Paul