Summarize the types of redundant structures, discuss what type of redundant mechanisms is the most reliable and safe, and draw the conclusion that two-by-two is a two-by-two structure.
Summarize the types of redundant structure, discuss what type of redundant mechanism is the most reliable and safe, and come to the conclusion that double two out of two structure.
Summarize the types of redundant structures, discuss what type of redundant mechanism is the most reliable and safe, and come to the conclusion that two times two take two structures.