T7:=REF(vol,6)/REF(VOL,7)>=2;
T6:=REF(VOL,5)/REF(VOL,6)>=2;
T5:=REF(VOL,5)/REF(VOL,4)>=1.5;
T4:=REF(VOL,4)/REF(VOL,3)>=1.5;
T3:=REF(VOL,2)/REF(VOL,3)>=1.5;
T1:=V/REF(VOL,1)>2;
T0:=C>O AND C>REF(C,1);
XG:T0 AND T1 AND (T3 OR T4 OR T5 OR T6 OR T7);
