1*23f24377SWarner Losh{ x[$1] = $1
2*23f24377SWarner Losh  delete x[$1]
3*23f24377SWarner Losh  n = 0
4*23f24377SWarner Losh  for (i in x) n++
5*23f24377SWarner Losh  if (n != 0)
6*23f24377SWarner Losh	print "error", n, "at", NR
7*23f24377SWarner Losh}
8