You are given a code:

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

Can you predict the output of `main_solution("pdbusn")` 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": "pdbusn"}, "ref_output": "p\u00abdsb\u00bbu\u00absjn\u00bbp\u00abdjb\u00bbu\u00absun\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + x), func_15('sjjuk'))", "funcname": "main_solution"}
rule