Spawning Random Creeps From All Areas

[Heresme]

I've got a trigger that currently works.

It spawns a random level 1 creep. Unfortunately, I've noticed it only spawns level 1 creeps from the tileset I'm using (lordaeron summer) whereas I want it to spawn level 1 creeps from every set.

Is there a way to make this happen by normal triggers?
If the answer is in variable form I'm hopeless there.

Thanks for any help.

 

[Happy]

i dont know whether there is another way but the only way i know is putting the units you want to be spawned in an unit type array and then trigger that these units are spawned....

if you need help tell me....