1-8
: 1M sets & casts 1 place, sets & petronella turns between 3s facing
  up **while** 1L stands for 2 bars then sets, casts 1 place & sets
9-16
: 1M sets in line with 3s & all 3 Adv+Ret then 1M advances to
  partner **while** 1L petronella turns between 2s & sets in line with
  2s then all 3 Adv+Ret, 1L pulling back RSh (bar 16) to face 2L
17-24
: 1L followed by partner dances tandem reel of 3 across with 2s (RSh to
  2L) to end in 2nd place own sides
25-32
: 1s dance RSh reels of 3 on sides giving RSh to 3s. 2 1 3