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

1-6
: 1s and 4s Petronella turn & set, Petronella turn to opp sides (no polite
  turn)
7-8
: 1s+2s & 3s+4s cicle 4H 1/2 round to left & join NH with partner facing
  up and down. (2) 1 (4) 3
9-16
: 9-10 All couples set advancing to pass next couple LSh 1 (2) 3 (4)

: **11-12** End couples turn 2H to face down/up **while** middle couples
  set advancing to pass LSh 1 3 (2) (4)

: **13-16** Repeat 9-12 to end 3 (4) 1 (2)
17-20
: 4s dance 1/2 Fig 8 up round 3s **while** 1s dance 1/2 Fig 8 down
  round 2s.  3 4 (1) (2)
21-24
: 4L+1L change places RH & set **while** 4M+1M set & change places RH. 3 1
  (4) (2)
25-32
: All Adv+Ret (1 step each), cross RH with partner; 3s+1s & 4s+2s
  circle 4H round to left. End 3 1 (4) (2)