Category: <b>resident utilities</b>
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<pre><b>INT B3 - ZIPKEY - CONVERT TWO-LETTER ABBREVIATION TO STATE CODE</b>

	AH = 71h
	BX = abbreviation, in either case (first letter in BL)
Return: CF set on error
	    AL = FFh
	CF clear if successful
	    AL = ZIPKEY state code
SeeAlso: AH=72h
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