I have a barcode font for the U.S. Postal System.  I got it from Lotus 
Amipro... but I don't have the information on calculating the check digit on 
zip+4.
 
The barcode font expects 10 digits (no dash, zip+4+checkdigit) between two 
slashes, thus: /1234567890/
 
Can someone help me with the formula or point me to somewhere where the 
paradox code is already down somewhere.
 
Thanks!
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