You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'thct'), func_15('axvorq'))

Can you predict the output of `main_solution("ephb")` 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": "ephb"}, "ref_output": "t\u00abhac\u00bbt\u00abexp\u00bbh\u00abbv\u00bb\u00abo\u00bb\u00abr\u00bb\u00abq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'thct'), func_15('axvorq'))", "funcname": "main_solution"}
rule