- f=lambda x,y:x>[]and y.pop()+x.pop()*f(x,y) 
-   
- print(f([5, 10],[4, 2])) 
- print(f([10, 10, 4, 62, 7],[1, 2, 3, 4, 5])) 
- print(f([5, 1, 10],[3, 0, 7])) 
- print(f([6, 6, 6, 6, 6, 6, 6, 6, 6, 6], [3, 1, 5, 5, 3, 0, 5, 2, 5, 4])) 
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