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

1-4
: 1s & 4s petronella turn into centre, change places with partners
  RH **while** 2s & 3s step up/down
5-8
: 1L & 4L followed by partner pass LSh to face corner (1L faces 3M, 1M -
  3L, 4L - 2M & 4M - 2L) & change places RH into St Andrews cross
9-16
: All Balance in cross formation, change place with corner RH & 4s+1s
  dance LH across 1/2 way all end on sides 2(1)4(3)
17-24
: All dance RSh reels of 4 on sides 1s & 4s do not end passing LSh but
  turn about to face other corner 2 4(1)(3)
25-32
: 4s & 1s turn corner RH & 2s+4s also 1s+3s circle 4H round to right