     "metadata": {},
     "source": [
      "## Test Cases\n",
      "\n",
      "* One or more empty strings -> False\n",
      "* 'Nib', 'bin' -> False\n",
      "* 'act', 'cat' -> True\n",
      "* 'a ct', 'ca t' -> True"
     ]
    },
 
</s>
    "* One or more None inputs -> False\n",
     "metadata": {},
     "source": [
      "## Test Cases\n",
      "\n",
    "* One or more None inputs -> False\n",
      "* One or more empty strings -> False\n",
      "* 'Nib', 'bin' -> False\n",
      "* 'act', 'cat' -> True\n",
      "* 'a ct', 'ca t' -> True"
     ]
    },
keep keep keep add keep keep keep keep keep keep
 Polish permutation challenge and solution
arrays_strings/permutation/permutation_challenge.ipynb