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invent invented were invented are invented
invent invented are invented were invented
are invented invented were invented have been invented
were invented invented was invented is invented
invent invented are invented were invented
was; discovered were; invented were; discovered was; invented
who invented potato chips where were potato chips invented when potato chips were invented when were potato chips invented
did; go; were invented would; go; had been invented had; gone; would be invented would have; gone; had been invented
A.were both invented was invented are both invented is invented
was：invented were；invented is；invented has；been invented
did, invent was, invented does, invent were, invented
had invented were invented should have been invented had been invented
invent invented are invented were invented
America is highly mechanized in agriculture agriculture innovation is quite popular in U. S. equipment is only available in fertilizing the plant different machines are invented to do different laborious jobs
invent invented are invented were invented
invent invented are invented were invented
never invented ever inventing ever invented never inventing
invent invented are invented were invented
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