{{explanation}}
3s & 4s on opp sides

1-8
: 2s+3s set & dance RH across 1/2 way, 3s+2s 1/2 turn partner RH, twirl &
  dance out to own side
9-16
: All circle 8H round to left for 2 steps, Men turn Lady behind them 2H &
  continue circle to places
17-24
: 1s+3s also 2s+4s set & petronella-in-tandem into middle, set &
  petronella-in-tandem to sides
25-32
: 1s+4s dance RH across, lead up/down cross & cast in 1 place. 3 1 (4)(2)