1-4
: All Petronella turn (Ladies face out of the set and Men face in) & all
  set, all pulling back RSh to face clockwise, Ladies joining RH, giving
  LH to partner
5-8
: All dance RH across 2/3 round & face partner
9-12
: All set, 3/4 turn partner LH finishing with all Ladies joining RH
13-16
: Ladies dance RH across 2/3 round **while** Men cast to partner's
  original place & meet "new partner". All turn new partner 3/4 LH
17-24
: All repeat bars13-16 twice from new positions to end facing original
  partner.  2 3 1
25-32
: All dance Grand Chain (1 bar per hand), All turn partner RH (pivot
  turn).  2 3 1