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

1-8
: 1s & 4s cross RH & cast 1 place, 1s+4s dance RH across & end 1M+4L
  also 4M+1L in prom hold facing out to pass RH corner person RSh
9-16
: All dance 1/2 reels of 3 on sides, 1s+4s dance LH across & end 1s
  also 4s in prom hold facing out to pass LH corner person LSh
17-24
: All dance 1/2 reels of 3 on sides, 1s dance up under arch made by 4s &
  cast to 2nd place **while** 4s dance down & cast up to 3rd place
25-32
: 1s+4s set advancing (form circle) & retire **while** 2s+3s chase 1/2
  way, all circle left 1/2 way.  2 4(1)(3)