Black Plague the button sequence for the chemicals

[N2iT]

The notes said something about the bottom row of buttons are reversed but then turns around and says that you can out them in in any order you want. Now I was careful to put them in in the exact order which was; Chlorine, Acetone, Iodine, Bromine, Nitrogen, Sulfur OK when I go to start the compound mixture it says I need to enter a different sequence. I know somebody out there knows what I'm doing wrong please help thank you