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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def init_config(overrides):
 	""" 	Install the config dict as pmxbot.config, setting overrides, 	and return the result. 	"""

	pmxbot.config = config = ConfigDict()
	config.setdefault('bot_nickname', 'pmxbot')
	config.update(overrides)
	return config