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

1-4
: 2s+3s dance 1/2 Tourbillion (turn partners 2H 1/2 way round & dance
  clockwise 1 place and set)
5-8
: 2s+3s turn 2H 1.1/4 to finish 2s on Ladies' side facing up, 3s on Man's
  side facing down in promenade hold (Lady on Man's right)
9-16
: 2s+1L+4M dance reels of 3 on side (2s+1L pass RSh) also 3s+1M+4L dance
  reels of 3 on sides (3s+4M pass RSh)
17-24
: 2s+3s dance 1/4 RH across, 2s dance down, cast up round 4s **while** 3s
  dance up, cast round 1s.  2s+3s cross LH
25-32
: 1s+3s also 2s+4s dance the Bourrel:

: 1M+3L (4M+2L) set advancing, 3/4 turn 2H & twirl to end BtoB (Lady
  facing up, Man down) **while** prtnrs chase anticl'wise 3/4 way,

: set to partners & turn 2H to own sides having changed places