Look up state abbreviations by FIPS codes (including District of Columbia and Puerto Rico). Will match the first two digits of the input codes, so should work for 5-digit county codes, or even longer tract and census block FIPS codes.
Vector of FIPS codes to look up; will match the first two digits of the code. Note that these are treated as strings; the number 1 will not match "01".
A vector of state abbreviations.
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