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volunteered to; clean volunteered; cleaning volunteered to; cleaning volunteered; clean
appeal attach contribute refer
w.num=1002; w.grade1=85; pw->num=1002; w.s.grade2=85;
to be graded graded to grade grade
num=1002; grade1=85; pw->num=1002; s.grade2=85;
courage wisdom devotion tendency
w.num=1002; w.grade1=85; pw->num=1002; w.s.grade2=85;
Grade SUM(Grade)/7 AVG(Grade) SUM(Grade)/COUNT(Cno)
possessed promoted proposed allowed