{{explanation}}
2 chords  -  Men move into middle to finish back to back facing partners

1-8
: All dance double reels of 4, passing partner RSh to begin & giving LH
  briefly in centre & end in original places
9-16
: All dance Grand Chain giving RH to partner to begin, one step to each
  hand. (Chain is danced around perimeter, Men dance anticlockwise &
  finish beside partners)
17-20
: All set & Petronella in Tandem one place anticlockwise.
21-24
: All set & Petronella in Tandem, Men finish in middle beside partner,
  facing anticlockwise
25-30
: All promenade 3/4 round set, finishing one place to right of their
  original place
31-32
: All turn partner RH to finish Men back to back in the middle