1-8
: 1s+2s dance RH across & dance LH across 1/2 way, 1s+2s change places LH
  on the sides
9-16
: 1s+2s+3s dance LSh parallel reels of three on the sides
17-24
: 1L & 2L and also 1M & 2M set and petronella-in-tandem, repeat
25-32
: 2s+1s+3s Adv+Ret for 2 steps & turn partner RH