Small correction for the author: > Copper stays copper, unless there are one or two electron heads in any cardinal direction, in which case it becomes an elect

Small correction for the author: > Copper stays copper, unless there are one or two electron heads in any cardinal direction, in which case it becomes an electron head should be > Copper stays copper, unless there are one or two electron heads in any neighboring cell, in which case it becomes an electron head I spent ages trying to figure out how the generators were working in their example before I looked up the rules elsewhere.