Definition 4 A Forward Path is a path from the input node to the output node. For example, x, to X2 to X to X4and X, to X2 to x are forward paths Definition 5: A Feedback Path or feedback loop is a path which originates and terminates on the same node. For example, x2 to x, and back to X2 is a feedback path Definition 6: A Self-Loop is a feedback loop consisting of a single branch. For example, A33 is a self-loopDefinition 4: A Forward Path is a path from the input node to the output node. For example, to to to and to to are forward paths. Definition 5: A Feedback Path or feedback loop is a path which originates and terminates on the same node. For example, to , and back to is a feedback path. Definition 6: A Self-Loop is a feedback loop consisting of a single branch. For example, is a self-loop. X1 X 2 X 3 X 4 X1 X 2 X 4 X 2 X 3 X 2 A33