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X+Y      X+Z     X-Y-Z
X-2Y-Z   X       X+2Y+Z
...

Terms not in common: X+Y+Z  VS X+Y-Z  AND X-Y-Z  VS X-Y+Z
                     X-2Y-Z VS X-2Y+Z AND X+2Y+Z VS X+2Y-Z

X+Y   X-Y-Z  X+Z
X-Y+Z X      X+Y-Z
X-Z   X+Y+Z  X-Y