From any 2x4 formation with the centers in columns (e.g. double pass thru or eight chain thru): Centers
Quarter Out (forming a momentary T-bone) and Run around the outsides [=Zip Code 1], Pass Thru [=Zip
Code 2], Ends Bend [=Zip Code 3], Pass Thru [= Zip Code 4], etc. As this happens, the original outsides move
into the center, without turning. Odd numbers give facing ends; even give back-to-back ends.
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