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Hi,
you can use advanced search on geocaching.com where you filtered cache name contained challenge and choose DT. Unfortunately it working only for one combination, column, row in DT or neighbor one.
For example geocaches contained challenge in name, 10000 km around Prague with D 4-5 and T4-5.
https://www.geocaching.com/play/search?lat=50.06694&lng=14.46025&origin=prague&radius=10000km&t=4-5&d=4-5&kw=challenge
Second option I found is to use live map in project-gc where you can use the same filters as on geocaching.com. I didn't found solution to find all DT combinations missing at once.
https://project-gc.com/Tools/LiveMap