Full_Description

   The MODIFICATION, IGNORE, FOLD, and [NO]TIE_BREAK options of
   the /COLLATING_SEQUENCE qualifier can also be used to modify the
   collating sequence. You can make more than one modification to
   the collating sequence. If you intend to modify any collating
   sequence, you must specify the sequence in the SEQUENCE option,
   even if it is the default sequence (ASCII).

   Because the FOLD, MODIFICATION, and IGNORE qualifiers are
   processed in the order in which they are specified, care should
   be taken when specifying the order of those qualifiers. Normally,
   FOLD should be specified after all MODIFICATION and IGNORE
   qualifiers to ensure that the effects of the MODIFICATION and
   IGNORE qualifiers apply to uppercase and lowercase characters.

   You can request that Sort/Merge ignore a character or character
   range within the given collating sequence by using the IGNORE
   qualifier.

   By default, in the Multinational collating sequence, Sort/Merge
   folds lowercase letters into their uppercase equivalents. If
   you want this folding to occur in the other collating sequences,
   you must specify a FOLD qualifier with the instructions for the
   collating sequence.

   Also, by default in the Multinational collating sequence,
   Sort/Merge uses numeric comparisons to break any ties in the
   collating values. Ties occur when two equal keys collate the
   same. If you do not want the default when using the Multinational
   collating sequence, specify the keyword NOTIE_BREAK. For tie
   breaking in the other collating sequences, specify a TIE_BREAK
   qualifier.