{{explanation}}
5 couple square set: 5s in centre facing, Man with back to 4s & Lady with back to 2s)

1-8
: 5s set turning to right to face sides as others circle 8H round to
  right 1/4 way, 5s set rotating to right to face each other as others
  set & repeat
9-16
: 5L+4s (in 2nd pl) also 5M+2s dance RH across, 5s pass RSh to dance LH
  across [5L with 1s (in 3rd pl) & 5M with 3s] 5s passing LSh to face
  sides
17-20
: 4s & 2s in prom hold dance 1/2 LSh reel of 4 across with 5s [5M
  facing 2s (4th pl) & 5L facing 4s], 5s passing LSh to face top/bottom
21-24
: 3s & 1s dance similar 1/2 LSh reel with 5s who end facing 4s (all now in
  original places)
25-32
: 5s+4s dance 1/2 RH across, 4s+3s dance 1/2 RH across, 3s+2s dance 1/2 RH
  across & 2s+1s dance 1/2 RH across to end 2 3 4 5 & 1s in centre