You are given a code:

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

Can you predict the output of `main_solution("ccmd")` 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": "ccmd"}, "ref_output": "c\u00abcic\u00bbc\u00abmwm\u00bbd\u00abdf\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, x), func_15('iwfr'))", "funcname": "main_solution"}
rule