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

1-8
: All dance RSh reels of 4 on side with 2s+3s passing RSh to end in
  original places
9-16
: 2s+3s 1/2 turn RH on sides, 3s+2s dance RH across, 1s+3s & 2s+4s 1/2
  turn LH on sides (end in St Andrews Cross 1s+4s giving RH in centre)
17-24
: All Bal-in-Line twice, 1s & 4s turn 3s/2s LH to end (3) 1 (4) 2
25-32
: 1s+4s dance RH across, 1s lead up to top & cast to 2nd pl **while** 4s
  lead down & cast to 3rd place
33-40
: 1M+4L & 1L+4M slip step across (Men pass BtoB), set, slip step back
  again (Ladies pass BtoB) & set **while** 2s & 3s set adv, slip step
  up/dn (Men pass BtoB), set & slip step back (Ladies pass BtoB)
41-48
: All circle 8h to left 1/2 way, set, end couples (2s & 3s) cross
  RH **while** middle couples set