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    "https://leetcode.com/problems/substring-with-concatenation-of-all-words\n",
    "\n",
    "\n",
    "Memory Limit Exceeded, 151 / 176 test cases passed.\n",
    "\n",
    "\n",
    "```python\n",
    "from itertools import permutations\n",
    "\n",
    "class Solution:\n",
    "    def findSubstring(self, s: str, words: List[str]) -> List[int]:\n",
    "        #8:56\n",
    "        wordsPermutations = [\"\".join(one) for one in permutations(words)]\n",
    "        totalLength = len(s)\n",
    "        targetLength = len(\"\".join(words))\n",
    "        results = []\n",
    "        for i, _ in enumerate(s):\n",
    "            if (totalLength - i + 1) > targetLength:\n",
    "                temp = s[i:i+targetLength] \n",
    "                if any([one==temp for one in wordsPermutations]):\n",
    "                    results.append(i)\n",
    "            else:\n",
    "                break\n",
    "        return results\n",
    "        #9:02\n",
    "        #debug until 9:05, Memory Limit Exceeded, 151 / 176 test cases passed.\n",
    "```"
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