In a locality, there are five small towns, $A, B, C, D$ and $E$. The distances of these towns from each other are as follows:
$AB=2km AC=2km AD>2km AE>3km BC=2km$
$BD=4km BE=3km CD=2km CE=3km DE>3km$.
If a ration shop is to be set up within $2$ km of each city, how many ration shops will be required?