data = open("C:\Users\tdoucet\Desktop\Test.csv")
dict = {}
for line in data:
	x = line.split(",")
	a = x[0]
	b = x[1]
	dict[a] = b

level0 = []
level1 = []
level2 = []
level3 = []
level4 = []
level5 = []	
level6 = []

	
for i in range (0,limit):
	for key, value in dict.iteritems():
		if value isnull:
			level0.append(key)
			if len(level0) == 0:
				break
	if value in level0:
		level1.append(key)
			if len(level1) == 0:
				break
	if value in level1:
		level2.append(key)
			if len(level2) == 0:
				break
	if value in level2:
		level3.append(key)
			if len(level3) == 0:
				break
	if value in level3:
		level4.append(key)
			if len(level4) == 0:
				break
	if value in level4:
		level5.append(key)
			if len(level5) == 0:
				break
	if value in level5:
		level6.append(key)
			if len(level6) == 0:
				break