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The table shows your success in completing the "81 matrix", that is the grid, in what you can see the different D/T ratings you have fullfilled.The entries in the table are sorted by the date on which you successfully found the first cache of a unique D/T rating. When your matrix is completely filled, no more entries will be made.
may be it is the way that leads to obtain the 81 geocaches matrix, so to find all combinations of difficulties / existing land ...