> Mr. West bought a new car! So he is travelling around the city.
>   One day he comes to a vertical corner. The street he is currently in has a width x, the street he wants to turn to has a width y. The car has a length l and a width d.
>   Can Mr. West go across the corner? 
> 
> Input 
> 
>   Every line has four real numbers, x, y, l and w.
>   Proceed to the end of file. 
> 
> Output 
> 
>   If he can go across the corner, print "yes". Print "no" otherwise. 
> 
> Sample Input 
> 
> 10 6 13.5 4
> 10 6 14.5 4 
> 
> Sample Output 
> 
> yes
> no 
>