... by: CivilizaThe Triple Empty Rectangle picture incorrectly uses a blue line to indicate a stong link between the 3's in E3 / E7 and another to indicate a strong link between the 7's in J3 / J7. The two strong links that should be joined with blue lines are the 7's in E3 / J3 and the 3's in E7 / J7.
Andrew Stuart writes:
Well spotted, I had a dizzy moment then, creating that image. Fixed now