Pentominoes squared Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(small)
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Pentominoes are plane shapes made of 5 squares.
There are 12 different arrangements.
These can be placed into a rectangle 10 by 6 or a rectangle 12 by
5.
Also, and less well known, is that if you add a 2 by 2 square piece
(X) above the now 13 pieces, will fit into an 8 by
8 square.
You are looking for a small camo'd clip-lock.
The cache is located at N51 5A.BCD E000 4A.CDE
Not knowing how easy/difficult this will be, clues may
follow.
Please park thoughtfully and at present the approach to the cache
can be extremely muddy.
Additional Hints
(Decrypt)
Gur yrggre pbiref gur ahzore erdhverq.
Vs ng svefg lbh qba'g fhpprrq ...