Alternating Triangles with Flips

Four Person, 12 Clubs

A - Feeder
B - Feeder
C - Feedee
D - Feedee

     B
D       C
     A

This is the Alternating Triangles pattern but A and B switch every four counts.

A - CSDS BSBS
B - ASAS DSCS
C - BSSS SSAS
D - SSBS ASSS