{{explanation}}
3 dancers arranged as Triangular set

1-12
: All 3 dancers Petronella turn & set 3 times back to place
13-16
: All dance RH across ending with dancer 1 facing down between 2 & 3
  facing up
17-24
: All set as Double Triangles, all set advancing, pull back RSh to invert
  Double Triangles; repeat back to original place
25-32
: All dance Coupé PdeB and Set
33-36
: All dance in, passing RSh in centre to end 1 place to right of start
  place
37-40
: All circle 3H round to left.  2 3 1