You are given a code:

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

Can you predict the output of `main_solution("tjexbn")` 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": "tjexbn"}, "ref_output": "m\u00abttm\u00bbj\u00abzje\u00bbp\u00abxeb\u00bbn\u00abx\u00bb\u00abb\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('mmzp', x), func_15(x))", "funcname": "main_solution"}
rule