This is used to begin an unsymmetrical sequence. From a squared set,
the designated couple walks straight across to the opposite position
and does a U-Turn Back. That opposite couple slides apart from each
other, and each person goes into the next position in the squared set,
all the way around to the spots vacated by the original designated
couple.
\sscircle{b4e,g3s,b3s,g2w}
\pscircle{g3e,b1s,g1s,b3w,g2w,b2n,g4n,b4e}
before Who's on First, #1 Couple Go
finished
This call is usually delivered as shown above, but might just have a
base number indicated, as in "Who's On Second".