new_contents: from timeit import default_timer as clock
  from sage.all import var
  var("x y z w")
  e = (x+y+z+w)**15
  f = e*(e+w)
  print f
  t1 = clock()
  g = f.expand()
  t2 = clock()
  print "Total time:", t2-t1, "s"
  
subject: Add the expand2 benchmark using Sage