{{explanation}}
Square set: Couples 1-4 in normal square, 5s & 6s inside square, 5s face 1s, 6s face 3s

1-8
: 5s & 6s dance reels of 3 with corner places, RSh to dancer to right (
  5M+1L+4M, 5L+1M+2L, 6M+2M+3L, 6L+3M+4L)
9-16
: 5s+6s dance RH across & LH across to end with couples in tandem (Lady
  following Man), 5M facing 4M, 6M facing 2M
17-24
: 5s+4M+2L also 6s+2M+4L dance RSh tandem reels of 3 up/down set
25-32
: 1s+5s also 3s+6s dance Ladies' Chain (Men cast to start). Bars 25-26 &
  29-30 Men pass LSh in centre. All end facing partner
33-40
: Lines of 4 up/down (1M+5L+6M+3L & 1L+5M+6L+3M) also 2s & 4s on sides
  set, Adv+Ret (1 step each) twice & set
41-44
: 1s+5s also 3s+6s dance 1/2 R&L
45-48
: 1s+3s dance 1/2 R&L in centre **while** 5s+2s+6s+4s set & dance 1 place
  clockwise round to end 4 5 2 6 with 1s+3s in centre

: Repeat twice from new positions