You are given a code:

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

Can you predict the output of `main_solution("ilhhj")` 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": "ilhhj"}, "ref_output": "i\u00ablih\u00bbh\u00abjii\u00bbl\u00abhfh\u00bbj\u00abj\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + x), func_15('iifjk'))", "funcname": "main_solution"}
rule