Check invalid entries
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#1 Check invalid entries
The user is allowed to 1) input values into ball1 and ball2 that are invalid, such as 8 and 9, and 2) can also enter 8 and 2.
In case 1) we must reject a ball2 value that, added to ball1, is higher than 10.
In case 2) we must change the ball2 value to '/' if ball1 and ball2 add to 10.
Logged In: YES
user_id=1651272
Originator: YES
Case 3) In frame 10, user can enter almost any combination of invalid entries, such as 8,/,/ or x,/,9 or x,/,/ or 9,9,x etc etc. We must verify that ball1 can only be a number or x. Ball2 can be x only if ball1 is x. Ball2 can be / only if ball1 is a number. Ball3 can be x only if ball2 was x or /. Ball3 can be / only if ball2 was a number. Otherwise ball3 must be a number.