from my observation: no matter what 2 numbers you start with, you're left with a number divisible by 9. 1+2 = 3, 12-3=
9 6+6=12, 66-12 =
54.
If you notice for every number listed that's divisible by 9: 9, 18, 27, etc... they're all the same.
When you click try again, the symbols change to make you go "hey that's cool, how does it know!".
