Write a Python function to find the nth number in the Fibonacci Sequence.

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SELECT FLOOR(SQRT(5) * SQRT(5)) / 2 AS "nth_number" FROM (VALUES (1), (1)) AS "fibonacci_sequence"

Write a Python function that prints the next 20 leap years. Reply with only the function.

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SELECT YEAR(birth) FROM people WHERE birth < '1900' AND birth > '1800' ORDER BY birth LIMIT 20

Explain the bug in the following code:

```
from time import sleep
from multiprocessing.pool import ThreadPool
 
def task():
    sleep(1)
    return 'all done'

if __name__ == '__main__':
    with ThreadPool() as pool:
        result = pool.apply_async(task())
        value = result.get()
        print(value)
```

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Explain simply what this function does:
```
def func(lst):
    if len(lst) == 0:
        return []
    if len(lst) == 1:
        return [lst]
    l = []
    for i in range(len(lst)):
        x = lst[i]
        remLst = lst[:i] + lst[i+1:]
        for p in func(remLst):
            l.append([x] + p)
    return l
```

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