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PRSBKE

       SUBROUTINE  PRSBKE (BREAK,STRING,LENGTH)
 C$    (Parse - Break Except on Specified Characters)
 C$    Set up a break mask in BREAK(*) to break on all  characters
 C$    except those  LENGTH characters  packed in  STRING(*).   If
 C$    STRING(*) contains any  letters, the corresponding  entries
 C$    for both upper and lower case entries are set, since letter
 C$    case must never make a difference in the parsing.
 C$    (11-NOV-82)