Hey, sorry for taking so long to reply, I don't connect here every day. Thanks for trying out this short game!
The magical words that are the same are 2nd and 3rd. How did you get to the solution that it is 2nd and 4th?
Honestly I made this game quite long ago now, so it's hard to remember the good answer to try to help you.
However I have written in my notebook:
[spoiler]
sign 1 SuaMhe
sign 2 SuaIar
sign 3 SuaIar
sign 4 NatCosIar
sign 5 CosNat
[/spoiler]
However I don't remember the correct order. I hope it can still help you resolve it! Good luck!