Given a mapping of Char to Char array. Given an input string S. Find all possible strings that can be generated.
every character in the input string should be replaced by a character in its corresponding mapped array of characters.
Ex:
'1' = ['a', 'b', 'c']
'2' = ['d', 'e']
.
.
.
Input : "12"
output: ["ad", "ae", "bd", "be", "cd", "ce"]

Question

Given a mapping of Char to Char array. Given an input string S. Find all possible strings that can be generated.
every character in the input string should be replaced by a character in its corresponding mapped array of characters. 
Ex:
'1' => ['a',  'b',  'c']
'2' => ['d', 'e']
.
.
.
Input : "12"
output: ["ad", "ae",  "bd",  "be",  "cd",  "ce"]

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