f = open("file_a_100000", "r")
a = f.readlines()
f = open("file_b_100000", "r")
b = f.readlines()
d = {}
for x in a:
d[x] = 0
for x in b:
if d.has_key(x):
d.pop(x)
a = d.keys()
f = open("file_c_100000", "w")
for x in a:
f.write(x + "\n")
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