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First three groups
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write, wroten, written
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buy, bought, bought
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know, knew, known
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dream, dreamt, dreamt
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eat, ate, eaten
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win,won, won
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sing, sang, sung
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fly, flew, flown
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swim, swam, swum
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stand, stood, stood
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teach, taught, taught
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build, built, built
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steal, stole, stolen
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drink,drank, drunk
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fight, fought, fought
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catch, caught, caught
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sit, sat, sat
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sleep, slept, slept
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ride, rode, ridden
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freeze, froze, frozen
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grow, grew, grown
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read, read, read
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think, thought, thought
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fall, fell, fallen
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run, ran, run
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blow, blue, blown
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hide, hid, hidden
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