arithma
Two sets of strings. The two sets have the same size. All strings in both sets have the same size.
By moving around columns, and replacing characters in each of the columns (while preserving the set of unique characters in that column, not replacing a character with another character that already exists in that column), determine whether one set can be transformed into the other.
"aa"
"ba"
can be transformed to
"bb"
"ab"
or to
"aa"
"ab".
"ab" can be transformed to "xx".