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

1-8
: 1s & 4s cross RH & cast in 1 place, 1s & 4s dance 1/2 Figs of 8
  round 2s/3s **while** 2s & 3s set & cross RH & on bar 8 1M+4L (prom
  hold) end facing down to 3M with their partners (prom) facing up to 2M
9-16
: All dance RSh promenade reels of 3 on sides
17-24
: 2s+1s also 4s+3s dance double Fig of 8 (1s & 4s cross up/down to start)
25-28
: 1s+4s dance LH across to end BtoB facing corners
  (1M+2L, 1L+2M, 4L+3M, 4M+3L)
29-32
: 1s & 4s turn corners RH to end BtoB facing corners again
33-40
: 1s set to corners, set on sides/ends, set to next corner & into centre
  facing 'new' corner (Hello-Goodbye Setting)
41-48
: 1s & 4s change places with 'new' corner RH, 2s+3s (in circle) set,
  opening out to face partner across set & cross RH & cast up/down
  to 2 4 (1)(3)