Special handling for contracted words.
Special handling for contracted words.

Too bad, but I cannot see how to avoid that.
Special handling is needed in order to prevent the contacted part to split again
(e.g unit split), permit regex match on a contracted word that can split (not
permitted word that can morpheme split), mark a contracted word part as
MT_CONTR instead of MT_SUFFIX or MT_PREFIX (to be checked in morpheme
combining).

FIXME: A contracted part still gets split.

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