1-8
: 1s set & cast 1 place, 1s dance between 3s & cast back to 2nd place
  as 2s+3s set & cross
9-16
: Set+Link for 3, 1s dance round each other RSh to 1M facing down, 1L
  facing up & turn R about about to end BtoB (1M facing 3s at top, 1L
  facing 2s in 3rd place)
17-24
: All set as Double Triangles, 1s petronella turn to end 1L between 3s (at
  top)/1M between 2s & all Set+Link for 3 to end 3 1 2
25-32
: All set & cross RH & chase 1/2 way.  2 1 3