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: : : 6 10 =60 1 2 3 4 5 6 R A B C a1 b1 c2 a2 b3 c7 a3 b4 c6 a1 b2 c3 S A B C a1 b2 c1 a2 b2 c3 a4 b6 c6 a1 b1 c2 a3 b4 c6 T B C D b1 c2 d4 b2 c1 d1 b2 c3 d2 1 R T 2 ∏A,DσS.B=T.B(S T) 7 8 9 10 4 = 90 1 10 3 =30 DEPT DeptNO DeptName Teacher TNO Tname Course CNO CName Credit Student SNO Sname Sex
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