1-16
: 1s dance full Petronella figure back to place **while** 2s step up
  bars 1-2, set bars 3-4, then follow 1s. 2s petronella turn to 2nd
  place on bars 15-16
17-24
: 1s lead down centre of set & back to top
25-32
: 1s+2s dance RH across once round & 1/2 Diamond Poussette to change
  places