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

1-8
: All set, 1s+4s 1/2 turn RH into prom hold **while** 2s & 3s cast to
  ends, 1s & 4s dance 1/2 reels of 3 across (1s RSh to 2M & 4s RSh to
  3M)
9-12
: 1s+4s dance 1/2 RH across, 1/2 turn partner RH into prom hold to face
  2nd corner (2L/3L) **while** 2s+3s set & cross back RH
13-16
: 4s+1s dance 1/2 reel with 2nd crnrs, 4s+1s dance round each other RSh
  3/4 way to face 1st crnr (2M/3M)
17-24
: 4s+1s dance 1/2 reel with 1st cnrs, 4s+1s pass RSh (1s face up, 4s down)
  & dance out between end cpls & cast to 2nd/3rd places
25-32
: 3s+1s also 4s+2s dance R&L to end 3 1 (4)(2)