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    "# Awkward array snippets\n",
    "\n",
    "Here are a bunch of computation routines that might not be so straight think up\n",
    "when first moving form loop based analysis. Takes these snippets adapt them to\n",
    "your own needs."
   ]
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    "## Object matching\n",
    "\n",
    "TO BE Written  --- assigned Yi-Mu Chen\n",
    "\n",
    "Given two collections A, and B, create a sub-collection in A that is composed of\n",
    "B matching some selection criteria that involves matching objects in collection\n",
    "B to collection A\n"
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    "def match(collection_A, collection_B):\n",
    "    collection_A = collection_[:]"
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