puzzle help needed

[Steve]

okay so i have four extaction ovens where you have to put an object inside I would like to make it so if you put the "object" inside the area that I've put in the oven The object self goes inactive and an other "object" goes actvive so it looks like you put it in the,
but I go to the problem I want to make it that you have to put four diffrent objects inside. so if you hav just on and yoyupull the lever you will see a messag in the screen "you don't have enough ingredients" but if you pull it when all the objects are inside but not at the correct place it says liek incorrect combination and if you have it int he right order it will just work.
But I can't really figure out how to make it so thta it only works if its the right combination.

Edit: also if there is a way to make and if statement with an active object than I think I could handle it myself :/