1-8
: All set, 1s+2s also 3s+4s dance 1/2 RH across, all set, 1s+4s dance 1/2
  RH across. Couples in 1st/3rd place face down, 2nd/4th place face up
9-16
: All petronella turn into lines across & set; all dance 1/2 reels of 4
  across
17-24
: All petronella turn to sidelines & set; all dance 1/2 reels of 4 on
  sides. All face in (3L & 2M pull back RSh)
25-32
: End couples (3s & 2s) cross RH. All circle 8H 3/4 round to Left. Finish
  in lines across 2 4 1 3

{{explanation}}
Devised for demonstration - dance 2x Strathspey, 2x Reel.  After 2nd time through all opposite original place, 4th time through back in start place