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    "# Ch13 Homework\n",
    "\n",
    "1. Implement a function `is_balanced(text)` that checks whether parentheses in a string are balanced.\n",
    "2. Create a queue-based simulation of a customer-service line with at least five customers.\n",
    "3. Represent a small company hierarchy as a tree and print it with indentation.\n",
    "4. Represent course prerequisites as a graph using a dictionary.\n",
    "5. Write a short paragraph comparing BFS and DFS. Include one situation where each would be useful."
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