{{explanation}}
2 chords - 2nd chord 3s+4s cross to opp sides

1-8
: 1s+4s turn 1.1/2 RH; cast down/up to 2nd/3rd place & 1/2 turn LH into
  prom hold,1s facing up/ 4s down (2s+3s step up/down bars 5-6)
9-16
: Reels of 3 across, 1s RSh to 2L, 4s RSh to 3L to start. End with 1s on
  Men's side, 4s on Ladies' side. Bar 16 1s+4s swap partners, 1M+4L face
  up, 4M+1L face down in prom hold
17-24
: Reel of 3 on sides, 1M+4L RSh to 2L, 4M+1L RSh to 3L to start. End 1s in
  3rd place opp sides, 4s in 2nd place own sides
25-32
: 1s/4s dance NHJ out of ends (4s up/1s down), cast back to 2nd/3rd place;
  all 4 couples turn RH. 2 4 (1) (3)