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"If at first you don't succeed, try, try again."
William Edward Hickson, Try Again.

NieR:Automata Choir Cover — 「Shadowlord/魔王」
https://www.youtube.com/watch?v=A-TiyreA3H0

"Her creators definitely would have created backups because of the iron law of reality: Shit happens. 
Redundancy would be an absolute necessity in a scheme that required decades to mature."
Glen Cook, Port of Shadows, Chapter 15 In Modern Times, Chronicles of the Black Company, 2018.

A2 expected the Aliens controlling 2B & 9S stooping to steal Emil's mask. 
None could perceive whether it is possible Pod 153 transports Emil to A2.
Devola & Popola were two pairs of Android twins: three of them survived.