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

1-8
: 2s+3s dance RH across, 2s+3s dance LH across part way to end 2M facing
  up & 3M down (Ladies on sides) **while** 1L & 4L petronella turn into
  middle & set
9-16
: 1L+2M+3M+4L dance reel of 4 up/down middle & on Bar 13-16 1M & 4M
  petronella turn to 2nd/3rd place & set to opposite dancer
17-24
: 1M+3L+3M+4M+2L+2M circle anticlockwise & back with 1M & 4M breaking away
  to face partners
25-28
: 1L followed by partner cast down Ladies' side to 3rd place & crosses to
  opposite side **while** 4L followed by partner cast up Men's side to
  2nd place & crosses to own side **while** 2s & 3s turn 2H moving out
  to end places. 2 4(1)(3)
29-32
: All turn 2H