三军会师

​A1:=EXIST(CROSS(MA(C,5),MA(C,10)),3);

A2:=EXIST(CROSS(MA(C,5),MA(C,20)),3);
A3:=CROSS(MA(C,10),MA(C,20));
A4:=MA(C,20)>=REF((MA(C,20)),1);
三军会师:A1 AND A2 AND A3 AND A4;