Pardon my sarcasm not meant to offend, but , ya, only 18 indicators
...and we know of how many? I don't know about you but I've got better things to do than figure out that rubic's cube. The system I'm trying out uses only 5 indicators but there are 6 possible patterns they can align into to give a signal...I'll posta couple of charts and let me know if you can figure it out...
...ya right!