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

1-8
: 1L+2M also 3M+4L change places RH, set diagonally & dance RH across once
  round
9-16
: 1M+2L also 3L+4M change places LH, set diagonally & dance LH across once
  round
17-24
: 1s & 4s chase clockwise 1/2 way to 4s in 2nd place & 1s in 3rd place,
  all set on sides, 2s & 3s cross RH **while** 4s & 1s 1/2 turn RH to
  face up/down
25-32
: 4s dance up & cast to 2nd place own side **while** 1s dance down & cast
  up to 3rd place on opp side & all set twice. 2 4 (1) (3)