{{explanation}}
3s & 4s on opp sides

1-8
: 1s+2s also 3s+4s dance 1/2 R&L. 1s & 4s dance 1/2 Fig of 8 round end
  couples
9-16
: 1s+4s set on sides, dance RH across 1/2 way & 1M followed by 4L dances
  down between 3s & casts up Men's side **while** 4M followed by 1L
  dances up between 2s & casts down Ladies' side (2) 1 (4) 3
17-24
: 1s in prom hold dance reel of 3 on Men's side (LSh to 2L to
  start) **while** 4s in prom hold dance reel of 3 on Ladies' side (LSh
  to 3L to start)
25-28
: 1s dance 1/2 reel of 3 across with 2s (RSh to 2M to start) **while** 4s
  dance 1/2 reel of 3 across with 3s (RSh to 3M to start).
29-32
: 1s dance down between 3s, separate & cast to 3rd place opposite
  side **while** 4s dance up between 2s (passing 1s RSh), separate &
  cast to 2nd places.  2 4 (1)(3)