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    "# Ch13 Preview Questions\n",
    "\n",
    "1. What is the difference between an abstract data type and a concrete implementation?\n",
    "2. Give one real-world example that behaves like a stack.\n",
    "3. Give one real-world example that behaves like a queue.\n",
    "4. Why is a dictionary a natural way to represent an adjacency list?\n",
    "5. When would a tree be a better model than a graph?"
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