      "    unique_counts1 = unique_counts(str1)\n",
      "    unique_counts2 = unique_counts(str2)\n",
      "    return unique_counts1 == unique_counts2\n",
      "\n",
      "print(permutations('', 'foo'))\n",
      "print(permutations('Nib', 'bin'))\n",
      "print(permutations('act', 'cat'))\n",
      "print(permutations('a ct', 'ca t'))"
     ]
    }
   ],
   "metadata": {
    "kernelspec": {
 
</s> remove     "def permutations(str1, str2):\n",
 </s> add     "def permutations_alt(str1, str2):\n", </s> remove     "print(permutations('', 'foo'))\n",
    "print(permutations('Nib', 'bin'))\n",
    "print(permutations('act', 'cat'))\n",
    "print(permutations('a ct', 'ca t'))"
 </s> add     "run_tests(permutations)"
    "run_tests(permutations_alt)"
      "    unique_counts1 = unique_counts(str1)\n",
      "    unique_counts2 = unique_counts(str2)\n",
      "    return unique_counts1 == unique_counts2\n",
      "\n",
    "run_tests(permutations_alt)"
    "run_tests(permutations_alt)"
    "run_tests(permutations_alt)"
    "run_tests(permutations_alt)"
     ]
    }
   ],
   "metadata": {
    "kernelspec": {
keep keep keep keep replace replace replace replace keep keep keep keep keep
 Updated unit test to use nose and moved it to Test Case section. 
arrays-strings/permutation.ipynb