N11:=REF(N1,1) ;
N2:= REF(C,1) REF(O,1) AND REF(C,2) REF(O,2) AND REF(C,3) REF(O,3);
N3:=C REF(O,1);
超买:N11 AND N2 AND N3 ;

N11:=REF(N1,1) ;
N2:= REF(C,1) REF(O,1) AND REF(C,2) REF(O,2) AND REF(C,3) REF(O,3);
N3:=C REF(O,1);
超买:N11 AND N2 AND N3 ;

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