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<oerjan> learn An union is the opposite of an ion.
author HackBot
date Thu, 13 Oct 2016 00:22:40 +0000
parents c989a1669243
children
line wrap: on
line source

#!/usr/bin/python
s=set()
try:
 while True:
  l=raw_input()
  if l not in s:
   s.add(l)
   print(l)
except EOFError:
 pass