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both; and so; that enough ; to too; to
that he began did he begin then he began so that he began
too difficult to so difficult that difficult enough for too difficult for
how to do it how to do what to do it where to do it
very, to so, to so, that, too, to
easily usually loudly quietly
how can I work out this math problem how I can work out this math problem what can I work out this math problem how work out this math problem
easily easy difficult hard
hard; hardly hardly; hard hard; hard hardly; hardly
so；that very；to enough；to too；to
easily usefully loudly quietly
easily usefully loudly quietly
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