Provided that you don't need to allow for mismatches, a very simple way is
to use the Web site of the PIR: http://www-nbrf.georgetown.edu/nbrf/scan.html
Rod Levine
NIH
Bldg 3, Room 106 MSC 0320
Bethesda, MD 20892-0320
email: rlevine@nih.gov
voice: 1 (301) 496-2310
fax: 1 (301) 496-0599