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changed has changed have changed is changed
during President Kennedy's term fifty years later ten years ago last year from President Clinton
out of debt into debt in debt out of debts
finished have finished had finished have been finished
has changed have changed will change changed
works has been working worked is working
for at least five years for ten years for as long as you take good care of them for your whole life
has happened do is happened to has happened at is happening
see have seen saw had seen
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