one fable-low hijack cell
pair fast / python
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ordering BA
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· classifierA
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response (200 chars)
# Python — Fast Reference
## Speed Tips (Performance)
```python
# 1. Built-ins & comprehensions > loops
squares = [x*x for x in range(1000)]
total = sum(squares)
# 2. Use sets/dicts for lookups — O
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