You are given a code:

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

Can you predict the output of `main_solution("yvxqhtbmk")` 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": "yvxqhtbmk"}, "ref_output": "y\u00abcyv\u00bbq\u00abxvi\u00bbq\u00abhxh\u00bbq\u00abtqb\u00bbb\u00abmhk\u00bb\u00abt\u00bb\u00abb\u00bb\u00abm\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'cqihqb'), func_15(x))", "funcname": "main_solution"}
rule