You are given a code:

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

Can you predict the output of `main_solution("kvx")` 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": "kvx"}, "ref_output": "k\u00abvkx\u00bbk\u00abvux\u00bb\u00abt\u00bb\u00abz\u00bb\u00abh\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + x), func_15('kutzhb'))", "funcname": "main_solution"}
rule