#!/usr/local/bin/python2
l1 = range(10)
l2 = range(10)
b = 11
for i in xrange(100000):
  g = len(l1)
  f = l1 + [b] + l2
  [e for e in f][g]
  '''l1 = l1[:]
  l2 = l2[:]
  for e in l1: pass
  for e in l2: pass'''