Correct!

Any two-digit number, AB, can be expressed as:

(A x 10) + B ...

When you run the formula given in the link, the expression becomes:

AB - (A + B)

Therefore:

(A x 10) + B - (A + B)

Which equals:

10A + B - A - B

This reduces to

10A - A, in other words 9A!

Look at all possibilities on the chart and every multiple of 9 will have the same symbol, just different after each reload.

;)

Pretty dam impressed guys...I knew there was a simple answer!

;)