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he knew he knows does he know did he know
has learned would have learned learned had learned
take over think over hand over go over
studies studied has studied had studied
he knew he had known had he known did he know
how he was happy how happy was he how happy he was he was how happy
an; a a; an an; an the; an
studied study had been studied had studied
an ; a a ; an an ; an the ; an
where on which when Which
where on which when which
has learned would have learned learned had learned
an; a a; an an; an the; an
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