Interlocked Boxes
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This concept identifies two rectangular 2x2 boxes of real people, each of which does the call. The most common application is from a 3x4.
| \sxvBBBs{.+.,g3n,b3s,g4n,b4s,.+.} | \sxvBBBs{.+.,b2s,g2s,g3n,b3s,.+.} |
| before Interlocked Boxes Ripoff | after |
Note that Interlocked Parallelogram could be applied to the same setup, and would have a different meaning.