{{explanation}}
 2s & 4s start on opp. sides

1-8
: 1s+2s also 3s+4s dance RH across, 1L followed by 1M casts below 2nd pl &
  1L crosses to 3rd pl Men's side & 1M ends in 3rd pl Ladies'
  side **while** 4L followed by 4M casts up above 3rd pl & crosses up to
  2nd pl Ladies' side & 4M ends in 2nd pl Men's side (2s & 3s step
  up/down) (2)4(1)3
9-16
: 2s+4s also 1s+3s dance LH across, 2L followed by 2M casts below 2nd pl &
  2L crosses down to 3rd pl Ladies' side as 1M dances down to 3rd
  pl **while** 3L followed by 3M casts up to 3rd pl & crosses up above
  2nd pl Men's side as 4M dances up to 2nd place (4s & 1s step up/down)
  4(3)2(1)
17-24
: All dance RSh 1/2 reels of 4 on sides, 1s & 4s turn RH **while** 2s+3s
  dance 1/2 Ladies' Chain
25-32
: 3L followed by 3M crosses & casts up to top & 3L crosses to Ladies' side
  as 3M casts up **while** 2L followed by 2M crosses & casts down to
  bottom (1s & 4s having stepped into middle places), 3s+1s also 4s+2s
  turn 2H on sides & all set to partners