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such difficult work so difficult work such a difficult work so difficult a work
so difficult very difficult so easy very easy
for; so of; such of; so for; such
when to work who to work what to work how to work
so； to work very too； to work out rather too； to work out quite too； to answer
too difficult to so difficult that difficult enough for too difficult for
so difficult a work such a difficult work so difficult work such difficult work
very, to so, to so, that, too, to
such; that so; that such; as so; as
such difficult such a difficult so difficult a so difficult
such a difficult problem that so a difficult problem as so difficult a problem that as difficult a problem as
please…work be pleased…work please…work with be pleased…work with
too difficult a problem as a too difficult problem that so difficult a problem that such a difficult problem as
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