1-8
: 1s cross RH, cast (2s step up); 1s petronella turn to 1M between 2s
  facing down, 1L between 3s facing up & All set
9-16
: All Adv+Ret up/down set; 1s pertonella turn to 2nd place own sides & All
  set
17-24
: 2s+1s+3s circle 6H round & back. 2 1 3