You are given a code:

def main_solution(x):
    return func_20(func_20(x, x), func_15('afuwd'))

Can you predict the output of `main_solution("ppnwe")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "ppnwe"}, "ref_output": "p\u00abpap\u00bbp\u00abnfn\u00bbw\u00abwue\u00bbe\u00abw\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, x), func_15('afuwd'))", "funcname": "main_solution"}
rule