You are given a code:

def main_solution(x):
    return func_20(func_1('thuobe', 4), func_15('nxk'))

Can you predict the output of `main_solution("xpzn")` 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": "xpzn"}, "ref_output": "t\u00abhnu\u00bbo\u00abbxe\u00bbt\u00abhku\u00bbobethuobethuobe", "ref_code": "def main_solution(x):\n    return func_20(func_1('thuobe', 4), func_15('nxk'))", "funcname": "main_solution"}
rule