      "class TestPermutations(object):\n",
      "\n",
      "    def test_permutations(self):\n",
      "        permutations = Permutations()\n",
      "        assert_equal(permutations.find_permutations(None), None)\n",
      "        assert_equal(permutations.find_permutations(''), '')\n",
      "        string = 'AABC'\n",
      "        expected = [\n",
      "            'AABC', 'AACB', 'ABAC', 'ABCA',\n",
      "            'ACAB', 'ACBA', 'BAAC', 'BACA',\n",
      "            'BCAA', 'CAAB', 'CABA', 'CBAA'\n",
 
</s> remove     "        assert_equal(permutations.find_permutations(None), None)\n",
    "        assert_equal(permutations.find_permutations(''), '')\n",
 </s> add     "        self.assertEqual(permutations.find_permutations(None), None)\n",
    "        self.assertEqual(permutations.find_permutations(''), '')\n", </s> remove         assert_equal(permutations.find_permutations(None), None)
        assert_equal(permutations.find_permutations(''), '')
 </s> add         self.assertEqual(permutations.find_permutations(None), None)
        self.assertEqual(permutations.find_permutations(''), '') </s> remove     "        assert_equal(permutations.find_permutations(string), expected)\n",
 </s> add     "        self.assertEqual(permutations.find_permutations(string), expected)\n", </s> remove     "        assert_equal(permutations.find_permutations(string), expected)\n",
 </s> add     "        self.assertEqual(permutations.find_permutations(string), expected)\n", </s> remove         assert_equal(permutations.find_permutations(string), expected)
 </s> add         self.assertEqual(permutations.find_permutations(string), expected)
    "        self.assertEqual(permutations.find_permutations(None), None)\n",
    "        self.assertEqual(permutations.find_permutations(''), '')\n",
      "class TestPermutations(object):\n",
      "\n",
      "    def test_permutations(self):\n",
      "        permutations = Permutations()\n",
    "        self.assertEqual(permutations.find_permutations(None), None)\n",
    "        self.assertEqual(permutations.find_permutations(''), '')\n",
    "        self.assertEqual(permutations.find_permutations(None), None)\n",
    "        self.assertEqual(permutations.find_permutations(''), '')\n",
      "        string = 'AABC'\n",
      "        expected = [\n",
      "            'AABC', 'AACB', 'ABAC', 'ABCA',\n",
      "            'ACAB', 'ACBA', 'BAAC', 'BACA',\n",
      "            'BCAA', 'CAAB', 'CABA', 'CBAA'\n",
keep keep keep keep replace replace keep keep keep keep keep
 #273: Remove nose dependency for recursion_dynamic/ (#280) 
recursion_dynamic/permutations/permutations_challenge.ipynb