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

1-8
: 1L+4M also 1M+4L dance Figs of 8 on own sides (dance between 2s/3s to
  start)
9-16
: 2s dance Fig of 8 round 1s **while** 3s dance Fig of 8 round 4s meeting
  in centre to form a circle
17-24
: 2s+3s set twice (in circle) on 2nd setting pivot right & dance LH across
  back to original places
25-32
: All dance reels of 4 on sides with 2s+3s ending with a 1/2 turn LH onto
  sides for Balancing in Line
33-40
: All Bal-in-Line twice, 1s+2s also 3s+4s 1/2 turn RH on sides, middle
  couples (4s+1s) dance LH across 1/2 way. 2 4 (1) (3)