1-8
: 1s & 4s cross RH & cast in 1 place, 1s+4s dance LH across (1s+4s end
  BtoB in centre facing corners)
9-16
: All set & change places RH with corners, set & change back with LH
17-24
: 1s+4s dance RH across & LH back **while** 2s+3s chase all the way round
  anticlockwise
25-32
: All set & 1s+4s 1/2 turn partner RH, 1M+4L chase clockwise 1/2 way as
  1L+4M 1/2 turn LH, 4s+1s cross RH to 2 4 1 3