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hadn’t thought haven’t thought didn’t think wasn’t thinking
when to work who to work what to work how to work
since unless because without
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a great deal of a great deal a number of lots of
since unless with without
look for go for go with go to for
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a great deal of a gread deal a number of lots of
not; better don’t you; it better don’t we; we’d better do you not; us better
hadn’t thought haven’t thought didn’t think wouldn’t think
Might he as try As he might try He might as try Try as he might
such a difficult problem that so a difficult problem as so difficult a problem that as difficult a problem as
can ' t, must can ' t, need can, may mustn't, can
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