{{explanation}}
3 couples in Triangular Set

1-4
: 1s Adv, face each other, set advancing passing LSh to 1M facing 3s, 1L
  facing 2s
5-8
: 1M+3s also 1L+2s dance RH across. 1s face each other (1M facing up, 1L
  facing down)
9-16
: 1s set, cross RH, cast clockwise round outside and end 1M facing 3s, 1L
  facing 2s
17-20
: 2s & 3s take promenade hold & all dance 1/2 RSh reel of 4. 1s face each
  other, 1M facing down, 1L facing up
21-24
: 1s turn 1.1/4 LH. 1M faces 2s (3rd place), 1L faces 3s (2nd place)
25-28
: Repeat bars 17-20.
29-32
: 2s & 3s promenade 2 places clockwise **while** 1s turn 1/2 RH to join
  promenade. Finish 2 3 1