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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 get_shutit_pexpect_sessions():
 	"""Returns all the shutit_pexpect sessions in existence. 	"""

	sessions = []
	for shutit_object in shutit_global_object.shutit_objects:
		for key in shutit_object.shutit_pexpect_sessions:
			sessions.append(shutit_object.shutit_pexpect_sessions[key])
	return sessions