A:=Max(Ref(C,-1),Ref(O,-1));
 B:=Min(Ref(C,-1),Ref(O,-1));
 Z:=(O<A) AND (O>B) AND (C<A) AND (C>B);
 Q:=If(C>O AND Z=1,1,If(C<O AND Z=1,-1,0));
 Q;

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