 A directed acyclic graph may be used to represent a network of processing elements . In this representation , data enters a processing element through its incoming edges and leaves the element through its outgoing edges . 
 A directed acyclic graph may be used to represent a network of processing elements . In this representation , data <a href='uninflect' title='1'><mark>enters</mark></a> a processing element through its incoming edges and <a href='uninflect' title='2'><mark>leaves</mark></a> the element through its outgoing edges . 
A directed acyclic graph may be used to represent a network of processing elements . In this representation , data enter a processing element through its incoming edges and leave da element thru its outgoing edges .