{{explanation}}
3s+4s start on opp. sides

1-4
: 1s+4s cross RH **while** 2s+3s change place RH on side (dancers moving
  clockwise end on nearest corner, dancers moving anticlockwise finish
  in centre facing nearest corner, all Ladies on 1st corner diagonal,
  all Men on 2nd corner diagonal), & all set
5-8
: Ladies dance 1/2 RSh diagonal reel of 4 as Men set to facing Man and
  turn RH
9-12
: Repeat bars 5-8 with Men dancing 1/2 diagonal reel and Ladies setting
  and turning RH. Finish 2M+4L, 3M+1L in middle in promenade hold, Men
  LSh to LSh
13-16
: 2M+4L dance out of Men's side, 3M+1L out of Ladies' side casting to left
  to enter top/bottom of set
17-18
: 2M+4L+3M+1L dance 1/2 RH across, stay in centre
19-20
: 2M+4L & 3M+1L turn RH to sides (all on sides next to partner, Lady on
  Man's left)
21-24
: 2s+4s & 1s+3s set, chase 1/4 clockwise (men cast into chase)
25-28
: 4s+1s set, turn partner 1/2 LH, Ladies face out
29-32
: 4s dance LSh round 2s (4L round 2L, 4M round 2M) as 1s dance similarly
  round 3s End  2 4 (1) (3)