If it's only for any unit in one group about any unit from another
group, you don't need the function;
The leader of group A shares knowledge with his men about
anybody in group B.
in a trigger's condition field:
"leader groupA knowsabout _x > 0" count units groupB > 0
or in a script:
?"leader groupA knowsabout _x > 0" count units groupB > 0
:note - the function comes in handy if you want to know if
anybody from one array knowsabout anybody from another array.
~S~ CD