You are given a code:

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

Can you predict the output of `main_solution("dxn")` 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": "dxn"}, "ref_output": "\u00abddd\u00bbm\u00abxxy\u00bbn\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('dmy', x))", "funcname": "main_solution"}
rule