1-8
: 1s turn RH, cast (2s step up).  1s Petronella turn into lines of 3
  across (1L between 2s, 1M between 3s). All set
9-16
: 1L+2M+3M also 1M+2L+3L dance RH across.  1s turn LH to 2nd place own
  sides & all set
17-24
: 1s followed by 2s dance down, cast up round 3s, dance up to top & 1s
  cast to face 1st corners **while** 2s end in 1st place
25-32
: 1s dance Corner Pass+Turn with 1st corners, dance Corner Pass+Turn
  with 2nd corners.  1s pass RSh to 2nd place own sides