M1:=1000*V1/V4 =1015 AND 1000*V1/V4 =975; M2:=1000*V2/V4 =1020 AND 1000*V2/V4 =980; M3:=1000*V3/V4 =1015 AND 1000*V3/V4 =985; M4:=M1 AND M2 AND M3 AND CROSS(V0,V1); M5:=M1 AND M2 AND M3 AND CROSS(V0,V3); XG:M4 OR M5;