Before revision:   It is found that there is a simple division rule of the state space by removing the self-loops when the attractors consist only of point attractors.
After revision:  In the network, all self-loops negatively surpress the node (self-inhibition loops) and the attractors are only fixed points, i.e. point attractors. It is found that there is a simple division rule of the state space by removing the self-loops when the attractors consist only of point attractors.