Reflect Notes.ipynb

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    "# Array\n",
    "- Python use reference when slide or extend an array. (Because python uses immutable value for integers and strings)\n",
    "## Dynamic Array Implementation\n",
    "- The array has an initial size and will expand twice when extending.\n"
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    "\" \".join()\n",
    "reversed()\n",
    "s.split()\n",
    "len(set(s))"
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