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Letterbox T/D grid

These are all the Letterboxes I have found up to 31st July 2019:-

Terrain
Difficulty 1 1.5 2 2.5 3 3.5 4 4.5 5
1 2 8 3 4 2 1 2 1 2 25
1.5 5 73 41 25 2 1 1 1 149
2 6 27 267 32 37 3 1 1 374
2.5 3 14 30 29 14 1 1 1 93
3 1 9 18 58 12 2 1 1 102
3.5 3 6 4 4 2 1 1 21
4 2 3 3 1 3 1 13
4.5 2 1 1 1 1 6
5 1 1
17 139 369 156 72 13 6 4 8 784

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for a list of found caches
of this Diff/Terr-combination

60 Diff/Terr combinations found, out of 81

215 (27.4%) finds were rated with Diff or Terr of 3 or greater (difficult caches)