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| def fib(n): | |
| if n < 2: | |
| return 1 | |
| return fib(n-1) + fib(n-2) | |
| def tail_fib(n, a=1, b=1): | |
| if n < 2: | |
| return b | |
| return tail_fib(n-1, b, a+b) |
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