      "        assert_equal(stacks.pop(), 5)\n",
      "        assert_equal(stacks.pop(), 3)\n",
      "\n",
      "        print('Test: Pop on no elements')\n",
      "        assert_equal(stacks.pop(), None)\n",
      "\n",
      "        print('Success: test_set_of_stacks')\n",
      "\n",
      "\n",
      "def main():\n",
 
</s> remove     "        assert_equal(stacks.pop(), None)\n",
 </s> add     "        self.assertEqual(stacks.pop(), None)\n", </s> remove     "        assert_equal(stacks.pop(), 5)\n",
    "        assert_equal(stacks.pop(), 3)\n",
 </s> add     "        self.assertEqual(stacks.pop(), 5)\n",
    "        self.assertEqual(stacks.pop(), 3)\n", </s> remove     "        assert_equal(stacks.pop(), 5)\n",
    "        assert_equal(stacks.pop(), 3)\n",
 </s> add     "        self.assertEqual(stacks.pop(), 5)\n",
    "        self.assertEqual(stacks.pop(), 3)\n", </s> remove         assert_equal(stacks.pop(), None)
 </s> add         self.assertEqual(stacks.pop(), None) </s> remove         assert_equal(stacks.pop(), 5)
        assert_equal(stacks.pop(), 3)
 </s> add         self.assertEqual(stacks.pop(), 5)
        self.assertEqual(stacks.pop(), 3)
    "        self.assertEqual(stacks.pop(), None)\n",
      "        assert_equal(stacks.pop(), 5)\n",
      "        assert_equal(stacks.pop(), 3)\n",
      "\n",
      "        print('Test: Pop on no elements')\n",
    "        self.assertEqual(stacks.pop(), None)\n",
      "\n",
      "        print('Success: test_set_of_stacks')\n",
      "\n",
      "\n",
      "def main():\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for stacks_queues/ (#276) 
stacks_queues/set_of_stacks/set_of_stacks_challenge.ipynb