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    "# ---------------------------------------------------------------\n",
    "# python best courses https://courses.tanpham.org/\n",
    "# ---------------------------------------------------------------\n",
    "# Given a collection of intervals which are already sorted by start number, merge all overlapping intervals.\n",
    "# For example,\n",
    "# Given [[1,3],[2,6],[5,10],[11,16],[15,18],[19,22]],\n",
    "# return [[1, 10], [11, 18], [19, 22]]\n"
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