need random unit tutrial!!!

[Commander_Trav]

i need a tutorial that will tell me how i can make a building create a random unit that can create multiple times,
exampe: press the "random" buttin 4 times
i get 1 gnoll, 2footman, and a murloc
that kinda thing, im making a melee map but every unit u build is random!

plz help

 

[Nevermore]

I took the liberty of creating the trigger for you. It works, and I believe it's leak-free. You'll need to edit it to your needs.

Hopefully it's what you need!