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study studied have studied had studied
*pw．year=1980； w．year=1980； pw-＞year=1980； w．s．year=1980；
often frequently recent frequent
often frequently recent Frequent
w.s.year=1980; w.year=1980; pw-＞year=-1980; *pw.year=1980;
*pw.year=198O; w.year=1980; pw->year=1980; w.s.year=1980;
*pw.year=1980; w.year=1980; pw-＞year=1980; w.s.year=1980;
*pw．year=1980； year=1980； pw-＞year=1980； s．year=1980；
*pw.year=1980; w.year=1980; pw-＞year=1980; w.s.year=1980;
*pw.year=1980； w.year=1980； pw-＞year=1980 w.s.year=1980；
*pw.year=1980； year=1980； pw-＞year=1980 s.year=1980；
often frequently recent frequent
*pw.year=1980; year=1980; pw-＞year=1980; s.year=1980;
*pw.year=1980; w.year=1980; pw-＞year=1980; w.s.year=1980;
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