Power Converter Hints
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* The shifters only fit certain spots and can be placed on the board without much effort.

* Toward the bottom-left, there is a spot with two primary-color inputs.  It doesn't make sense to put a subtractor there.  Use a combiner.

* Close to the middle of the board is a spot that has a yellow and a blue input.  You can't subtract blue from yellow, so this must be a combiner.

* The remaining two spots are the two subtractors.

* Now label or color the lines and work out the final output colors.  

* Confirm that your outputs are:
  - red
  - green
  - white
  - cyan
  - cyan
  - magenta
  - yellow
  - blue
  - black

* Those are the English names, but who did Luke buy the power converter parts from?  Use the equivalent Jawa names.

* Take the first letter of each Jawa color name.