Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the null and undefined errors pattern
Cannot read properties of undefined, NoneType has no attribute, NaN appearing from nowhere.
What went wrong: the else branch stores 5 in a variable but has no return. A function that ends without return gives back None.
The fix: else: return 5
Remember: every path through a function needs its own return.
The pattern behind it: null and undefined errors.
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