1-8
: 1s cross down (touch RH briefly) to BtoB in centre facing opp sides,
  1s+corners set as in Double Triangles; 1s+1st corners dance 1/2 diag
  reel of 4. End 1L in middle at top, 1M in middle 3rd place
9-16
: 1s cross down (touch RH briefly) to BtoB in centre, 1M facing up, 1L
  down, 1s+corners set as in Double Triangles; 1s+2nd corners dance 1/2
  diag reel of 4. 1s end in 2nd place opp sides. (3) (1) (2)
17-24
: 3s+1s+2s Adv+Ret; 1s petronella turn (1M between 3s at top, 1L between
  2s at bottom) **while** 2s & 3s set, rotating in place (pull back RSh)
  & all set
25-32
: All Adv+Ret (up/down); 1s petronella turn to 2nd place own
  side **while** 2s & 3s set, rotating in place (pull back RSh) & all
  set
33-40
: 1s dance diag R&L (1M down, 1L up). End 2 1 3