1-8
: 1s lead down (3 bars), lead up (3 bars) & cast (2s step up). 1s face
  down.  2 1 3
9-16
: 2s+1s+3s dance Grand Chain (2s cross to begin)
17-20
: 1s set advancing to 1st corners, turn 1st corner 2H into lines of 3
  across (1L between 2s, 1M between 3s), facing 2nd corners
21-24
: Repeat 17-20 with 2nd corners. 1s end in 2nd place opp side
25-32
: 1s repeat 17-24 with 3rd then 4th corners & end in 2nd place own side
33-40
: 1s cross up RH, cast round 2s, cross RH & cast round 3s (3s step up)
  into 3rd place own side.  2 3 1