CC:=REF((C-O)/2+O,1);A:=C<O;A1:=C>O AND C>REF(O,1) AND O>REF(C,1);A2:=C<O AND O<=REF(C,1) AND VOL>REF(VOL,1) AND C+0.02>=CC AND C>REF(O,1);XG:REF(A,2) AND REF(A1,1) AND A2;