A slightly more restricted version of this is used at lower
levels. The general rule is that the number of people who
cross over to the other setup must be between 2 and 4. In
some cases (diamonds, for example), only the very center 2
move over to the other subsetup
\sxhdiamonds{g1s,b2w,g2n,b1e}
\sxetees{g4s,b2s,b1s,g1s}
before Center 6, Stretched Triangle, Convert the Triangle