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This, to It, for This, for It, to
both; and so; that enough ; to too; to
hard difficult simple easier
how to do it how to do what to do it where to do it
very, to so, to so, that, too, to
so , neither such a , none so a , neither such a , neither
so, neither such a, none so a, neither such a, neither
so, neither such a, none so a, neither such a, neither
easily easy difficult hard
hard; hardly hardly; hard hard; hard hardly; hardly
so；that very；to enough；to too；to
hard difficult simple easier
face prevent raise analyze
so, neither such a, none so a, neither such a, neither
so hard a ; a few so hard a ; few
such hard a ; few such a hard ; a few
gone on with caught up with come up with kept up with
work at it work it on work out it work it out
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