{{explanation}}
2 chords: 3s & 4s cross over on 2nd chord

1-4
: 1s+2s also 3s+4s set & dance 1/2 RH across
5-8
: All 4 couples dance Set+Link in tandem:

: All set. Top 2 Ladies & bottom two Men cast, with outside people casting
  in one place & inside people casting to the other end of the
  set **while** the top 2 Men & the bottom two Ladies dance forward,
  with outside people casting in one place & inside people casting to
  the other end of the set
9-16
: 4s+2s also 3s+1s dance a Men's Chain. 2s & 3s finish in a line of 4
  across the dance, the 2 Ladies' back to back facing non partner
17-20
: 2s+3s dance 1/2 reel of 4 across. At the end centre dancers do not pass
  but 3/4 LH turn to finish shoulder to shoulder (2L facing Men's
  side, 3L facing Ladies' side)
21-24
: 4s+2s also 3s+1s dance RH across to finish in diagonal lines of 4
  (between 1M & 2L's places & the same diagonal at the bottom) both
  hands joined with partners, 4L & 2M also 1L & 3M back to back
25-32
: 4s+2s also 3s+1s dance Hello-Goodbye Poussette:

: **25-26** All set on the diagonals (start right foot) moving on 2nd step
  into lines across with 4M & 2L also 1M & 3L BtoB)

: **27-28** Repeat, moving on 2nd step into lines on the next diagonals &
  original dancers back to back

: **29-30** Repeat, moving on 2nd step into lines up & down with 4M & 2L
  also 1M & 3L back to back

: **31-32** All dance a Petronella turn to the sides.  2 4 (1) (3)