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>SEQUENCE-ID-STRING commentary string
SEQUENCE_LETTERS_AT_MOST_80_PER_LINE...

# require that there be three file name args on the command line:
#  -- input file1
...
#    write the ID-string to the output file
#    if necessary, add line-feeds into the sequence string at 80-char 
+intervals 
#    write the sequence string to the output file