one-out-of-two system

Two out of Three

two out of two

two-out-of-three logic

two-out-of-three principle

two-out-of-two logic

recruitment system of out-of-manning personnel

Three-three-two pattern

code， two-out-of-five

linear system of two order

one out of two twice

one-out-of-two arrangement

system of two certificates

two out of five code

two out of four

Two out of Tree

two-out-of-five

two-out-of-five code

U+L ventilation system of two intakes and one retu