Rather than "at once," just cycle through as fast as you can. Eventually, the act of cycling blurs the positions so that you do achieve a fourth position.
It's sort of like, hmmm, sort of like how over time the instructions of "take a slice of bread, put mayo on it, put cheese on top of that slice, etc." eventually becomes generalized into the skill of "make a sandwich," and how eventually the instructions of "make a sandwhich, place it in a plastic bag, find some fruit, pack a bottle of diet soda or carbonated water, wrap two pretzel rods in a paper towel, etc." becomes generalized into "pack a lunch."
Then again, that's just my take on it.