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while since before the minute
looked, looked saw, looked saw, saw looked, saw
that we were how happy how happy were we that how we were happy how happy we were
had we heard we heard did we hear we have heard
before; when when; since since; while since; before
immediately the moment as soon as while
had we known we had known did we know we knew
quite a few quite much quite many quite some
we were advised not to accept it we were getting a new edge for a different purpose we saw an example of a good word being misused we saw a word serving for a different purpose
walked walking walks being walking
have we seen we have seen have seen we we saw
a; a the; a a; the the; 不填
we knew we had known did we know had we known
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