Create a function that returns true if two strings share the same letter pattern, and false otherwise.
SameLetterPattern("ABAB", "CDCD") ➞ true
SameLetterPattern("ABCBA", "BCDCB") ➞ true
SameLetterPattern("FFGG", "CDCD") ➞ false
SameLetterPattern("FFFF", "ABCD") ➞ falseN/A