{{explanation}}
9 Dancers in triangular formation, 1 Man with 2 Ladies per side of triangle

1-8
: All set, Men petronella turn to face partners (Ladies continue to set) &
  circle 3H round to left
9-16
: Men dance RH across & LH back in centre **while** Ladies cross RH, turn
  next Lady LH once round, cross RH back to place
17-24
: All set, Ladies make arch & Men dance under & face in, Men set
  HS **while** Ladies chase 2/3 clockwise to new partner
25-32
: Men dance RSh reels of 3 with new partners, RSh to Lady on right to
  start