1-4
: 1s cross down & loop round to face out on opposite sides as for double
  triangles
5-8
: Set as in double triangles & 1s dance out & turn right about to face
  in **while** 2s & 3s dance in & turn right about to face out
9-16
: Set (Inverted Triangle formation) & 1s dance in **while** 2s & 3s dance
  out all turning R about, 1s dance RSh round 1st corner to face 4th
  corner
17-24
: 1s dance LSh reels of 3 across
25-32
: 1s dance RSh reels of 3 on own sides (RSh to 3rd corner) & end in middle
  RSh to RSh
33-40
: 1s set & turn about, set & dance RSh round 4th corner to 2nd places