Original sentence: Apart from the typical corner, there are fast and slow corners, where the carrier mobilities are higher and lower than normal, respectively.For example, the FS corner designates fast NFETs and slow PFETs.These variations often cause significant changes in the duty cycle and slew rate of digital signals, and can sometimes result in catastrophic failure of the entire system.This variation may occur for many reasons, such as minor changes in the humidity or temperature changes in the clean-room between wafers, or due to the position of the die relative to the center of the wafer
Edited sentence: Fast and slow corners exhibit carrier mobilities that are higher and lower than normal, respectively.For example, a corner designated as FS denotes fast NFETs and slow PFETs.In this naming convention, three corners exist: typical, fast and slow.This variation can cause significant changes in the duty cycle and slew rate of digital signals, and can sometimes result in catastrophic failure of the entire system.Variation may occur for many reasons, such as minor changes in the humidity or temperature changes in the clean-room when wafers are transported, or due to the position of the die relative to the center of the wafer