Substitutes digits for the letters to make the following relation true
S T I L L
+ W I T H I N
---------------
L I M I T S
Note that the leftmost letter can‟t be zero in any word. Also, there must be a one-to-one mapping
between digits and letters, e.g. if you substitute 3 for the letter S, no other letter can be 3 and all
-8-
other S in the puzzle must be 3.