You are given a code:

def main_solution(x):
    return func_20((x + x), func_13('brcfr', '|'))

Can you predict the output of `main_solution("aqxdd")` 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": "aqxdd"}, "ref_output": "abq|xrd|dca|qfx|drd", "ref_code": "def main_solution(x):\n    return func_20((x + x), func_13('brcfr', '|'))", "funcname": "main_solution"}
rule