Before revision:  After the first-layer fuzzy systems are designed, we pass the data through the first layer and replace the inputs in the original data set by the corresponding outputs of the first layer to form a new data set , then we design the second-layer fuzzy systems based on this new data set in the same way as designing the first-layer fuzzy systems.
After revision:  After the first-layer fuzzy systems are designed, we pass the data through the first layer to form a new data set , then we design the second-layer fuzzy systems based on this new data set in the same way as designing the first-layer fuzzy systems.