You are given a code:

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

Can you predict the output of `main_solution("yunpxhedeq")` 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": "yunpxhedeq"}, "ref_output": "y\u00abkyu\u00bbo\u00abnuo\u00bbp\u00abbnx\u00bbc\u00abhpe\u00bbd\u00abexq\u00bb\u00abh\u00bb\u00abe\u00bb\u00abd\u00bb\u00abe\u00bb\u00abq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'koobc'), func_15(x))", "funcname": "main_solution"}
rule