Look At These Numbers Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(micro)
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The Cache is with 2.5 KM of the posted coordinates.
Replace A ,B, C and D with the proper digits in the "series":
13, 1A, 12, 1B, 1C, 18, 1D, 50, 51, 55, 53 .
Calculate the final coordinates.
E=A+B-C
F=C-A
G=C-A
H=A+C-B
I=D-B+1
J=D-1
K=D
L=C+1
Cache is at: N 45° 5E.FGH W 077° 1I.JKL
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Additional Hints
(Decrypt)
Vg'f gvzr gb guvax bhgfvqr gur obk.