new_contents: import sys
  sys.path.append("..")
  from timeit import default_timer as clock
  from csympy import var
  var("x")
  e = 1
  for i in range(1, 351):
      e *= (i+x)**3
  #print e
  t1 = clock()
  f = e.expand()
  t2 = clock()
  print "Total time:", t2-t1, "s"
  
subject: Add expand4 benchmark