In the multiplication given below, all the digits, except one, were consistently
replaced by another digit:
Find the substitution code and restore the original multiplication.
What I meant:
Solving the ABC*CDE=EAIAGG (forget the partial products) yields two distinct solutions (Charlie's or any similar program):
Compare with the given numbers (forget the partial products):
Only b) solution has one digit (digit "1") invariant while coded.