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Double Switch (8)

A level variation of Vertical Switch - Compress (8). Instead of switching 8 inputs from one side, you need to switch 4 on each side and send it to the other. I do not currently see a way of doing this with minimum footprint, but I'm working on a solution >.<

If the first 3 'Vertical Switch' levels were Beginner, Normal and Hard, this would be Expert.

Despite the layout, even getting a solution without caring for optimisation can take some time.

Edit: I'm going to make smaller versions of this puzzle, so it may be better to start on those (when I have submitted them).