{{explanation}}
2 chords - 3s+4s cross to opp sides on 2nd chord

1-8
: 2s+3s petronella in tandem & set, 2s+3s circle 4H round to left to
  finish back to back in middle facing corners
9-12
: All set, all change places RH with nearest corner to finish with 1s+4s
  in the middle.
13-16
: 1s+4s dance LH across to finish back to back in the middle facing same
  corner position **while** 2s+3s dance clockwise to next corner to face
  diagonally in, set & finish 2s/3s facing down/up
17-24
: All dance reels of 4 on the sides (1s & 4s finish on sides) 2 1 (4) (3)
25-30
: 2s+3s 1/2 turn partner 2H to face down. 2s dance down into 4th
  place **while** 3s cast up to 1st place
31-32
: All set. 3 1 (4) (2)