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[] = 1/4 of a unit
= 1/4 of a door block
= 1/4 touchplate
[] []
[] []
So a touchplate on either side of the doors and opposite a door. The doors MUST be diagonal to one another!
I don't know who first figured it out so creds to whoever did!
(Btw feel free to post you schematics for redstone doors, etc)