<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _validate_required_settings( 		self, application_id, application_config, required_settings 	):
 		"""All required keys must be present"""


		for setting_key in required_settings:
			if setting_key not in application_config.keys():
				raise ImproperlyConfigured(
					MISSING_SETTING.format(
						application_id=application_id, setting=setting_key
					)
				)