1-8
: 1s+2s dance RH across, 1s set to 2s & 1/2 turn (1s dancing between 2s).
  2 1 3 4
9-16
: All dance reflection reels of 4 on sides (1s in & down, 3s in & down)
17-24
: 1s+3s petronella turn into centre (merging 1L+3L+1M+3M) **while** 2s+4s
  change places RH on sides & all set, 1s+3s petronella turn to opposite
  side **while** 4s & 3s cross LH & all set
25-32
: Repeat bars 17-24 back to own sides
33-40
: 1s cross RH, cast to bottom & turn 2h 1.1/2 times. 2 3 4 1