Interlocked Parallelogram

This concept identifies two parallelogram (non rectangular) 2x2 boxes of real people, each of which does the call. This is commonly done in a 2x4:

\syhlines{g1n,b1n,g2s,b2s}	\syhlines{g1e,b1e,g4e,b4e}

before Interlocked Parallelogram Bingo	after

Another application is from a 3x4:

\sxvBBBs{.+.,g3n,b3s,g4n,b4s,.+.}	\sxvBBBs{.+.,b2s,g3n,b1s,g4n,.+.}

before Interlocked Parallelogram Ripoff	after

Note that Interlocked Boxes could be applied to the same setup, and would have a different meaning.