DL
Size: a a a
DL
K
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DL
H
DL
DL
K
DL
H
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domens = set()
with open("1.txt", "r") as fin, open("2.txt", "w") as fout:
for line in fin:
dom = line.strip().split('@')[~0].split(':')[0]
if dom not in domens:
fout.write(line)
domens.add(dom)VA
VA
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VA
I

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DL