Before revision:  For the out-degree distribution, whose top nodes form the foundation of the entire network, the initial condition for a dynamic model, evolving towards a steady scale-free frequency distribution of nodes, determines the finite limit to the number of top nodes that the mature out-directed network can have  .
After revision:  For the out-degree distribution, whose top nodes form the foundation of the entire network, the initial condition for a dynamic model, evolving towards a steady scale-free frequency distribution of nodes, determines the finite limit to the number of top nodes that the mature out-directed network can have . The number of nodes contributing out-directed links grows with each passing generation of software release, but this growth ultimately saturates towards a finite value due to the finiteness of semantic possibilities in the network .