Recursion, codes of the string question

#1

Could anyone please help me with this question?

#2

The question says all possible code, like for the given example 1125
1,1,2,5 -> a a b e
1,1,25 -> aay
1, 12, 5 -> ale
11, 2, 5 -> kbe
11, 25 -> ky

So use recursion to solve the problem.

#3

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