old_contents: #! /usr/local/bin/python
  
  # This Python program sorts and reformats the table of keywords in ref2.tex
  
  import string
  l = []
  try:
  	while 1:
  		l = l + string.split(raw_input())
  except EOFError:
  	pass
  l.sort()
  for x in l[:]:
  	while l.count(x) > 1: l.remove(x)
  ncols = 5
  nrows = (len(l)+ncols-1)/ncols
  for i in range(nrows):
  	for j in range(i, len(l), nrows):
  		print string.ljust(l[j], 10),
  	print
  
new_contents: #! /usr/bin/env python
  
  # This Python program sorts and reformats the table of keywords in ref2.tex
  
  import string
  l = []
  try:
  	while 1:
  		l = l + string.split(raw_input())
  except EOFError:
  	pass
  l.sort()
  for x in l[:]:
  	while l.count(x) > 1: l.remove(x)
  ncols = 5
  nrows = (len(l)+ncols-1)/ncols
  for i in range(nrows):
  	for j in range(i, len(l), nrows):
  		print string.ljust(l[j], 10),
  	print
  
subject: Use #!/usr/bin/env python instead of #!/usr/local/bin/python.