What cylinders go to which coil pack?

I have a 4 cyl. Chevy Corsica that needed a coil pack replaced. There are two of them, one goes with the odd number cylinders ( 1 & 3) and the other goes with the even number cylinders (2 & 4) Typically, the number 1 cylinder is the firing cyliinder and if that coil pack is gone, the car should not start. My car is a rarity that actually started and ran on the 2 & 4 cylinders.