A-186 A-186 Gate/Trigger Combiner click to enlarge Module A-186 is a very simple, passive unit that combines up to 7 gate, trigger or analog signals by or-wiring. F...
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You probably just need to cut the traces and replicate the end of the circuit (position 8) on (postion 4) to create 2 "3 in 1 out" circuits.

You could probably also modify a a-180 Multiples to do the same thing.