1-8
: 1s lead down middle (3 steps), lead up (3 steps) & cast to 2nd place (2s
  step up)
9-16
: 2s+1s+3s Adv+Ret, 1s turn RH to end in middle facing up
17-24
: 1s dance up, cast round 2s, meet in middle, dance down & cast up
  round 3s into 2nd place own sides
25-32
: 2s+1s+3s dance 6H round & back