1-8
: 1s set, cast, dance LSh round 1st corners to finish BtoB in centre
  facing opposite sides
9-12
: 2s+1s+3s set (as in Double Triangles), 1s PdB out & turn about to face
  in **while** 2s+3s PdB in & turn about to face out
13-16
: 2s+1s+3s set (Inverted Double Triangle). 1s set rotating in place to
  face clockwise **while** 2s+3s dance round partners to 1st/3rd place
  opp sides facing clockwise (2) (1) (3)
17-24
: 2s+1s+3s chase 1/2 way round to own sides & turn partners RH into
  promenade hold facing up
25-32
: 3s+1s+2s dance Allemande  2 1 3