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## python-wait_group.py
from threading import Lock


class WaitGroup:
    def __init__(self):
        self.count = 0
        self.complete = Lock()
        self.lock = Lock()

    def add(self, n):
	from threading import Lock


	class WaitGroup:
	def __init__(self):
	self.count = 0
	self.complete = Lock()
	self.lock = Lock()

	def add(self, n):