US PO Abbreviation GC Challenge
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First you must find 25 state post office abbreviations (see related web site) that are in the GC numbers of caches you may have found. For this challenge you can only use the 50 US states and not the territories. This cache can not be used as one. For example this cache's GC number is GC30TXM. It has the PO abbreviation for Texas in it TX. You may use 1 for I or L , 0 for O , 5 for S and V for U.
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