You are given a code:

def main_solution(x):
    return func_20(func_15(x), ('catszm' + 'orex'))

Can you predict the output of `main_solution("xxmli")` 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": "xxmli"}, "ref_output": "\u00abcxa\u00bbt\u00absxz\u00bbm\u00abomr\u00bbe\u00abxl\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), ('catszm' + 'orex'))", "funcname": "main_solution"}
rule