constructing strings from arithmetic

I'm searching for a program that can construct strings from arithmetic.
For example I need the following string: aaaa, the program should
generate it by telling it to print a string of n consecutive a, n being
equal to 4 for this example.
The goal is to add blank characters at the beginning of some lines in a
script by respect to depth of code (imagine nested loops for example).
I'm trying to see if awk can do that.
.

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