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

1-8
: All dance Grand Chain
9-16
: 1s & 4s cross RH, cast in 1 place, dance RH across & 1/2 turn RH into
  prom hold (1s facing Men's side & 4s facing Ladies side)
17-24
: 1s & 4s dance reels of 3 on sides (LSh to Lady on left) & end in middle
  1s facing 4s
25-32
: 1s+4s set to each other, set advancing to pass LSh to face corners, 4s &
  1s turn corners (nearer hand) as they dance out between ends. 2 4 (1)
  (3)