1-8
: 1s dance in & cast 1 place, dance down between 3s & cast up to 2nd
  places own sides
9-16
: 2s+1s+3s dance RSh round partners back to places & chase clockwise 1/2
  way
17-24
: 3s+1s+2s circle 6H round & back
25-32
: 3s+1s+2s dance LSh round partners back to opposite sides & chase
  anticlockwise 1/2 way