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      "content": "The simplest one-liner is to use Python's built-in `sum` function:\n\n```python\nsum(xs)\n```\n\nIf you need a reusable function (also a one-liner), you can define a lambda:\n\n```python\nlambda xs: sum(xs)\n```\n\nOr a named function:\n\n```python\ndef total(xs): return sum(xs)\n```\n\nAll of these return the sum of the list `xs`.",
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