{{explanation}}
3 couples in triangular formation with 4th Man in centre, on chord all bow/curtsey inward with 4M bowing to 1s then faces 2s

1-8
: 4M sets to 2s, sets to 3s, circles 3H round to right with 1s & ends
  facing 3s
9-16
: 4M circles 3H round to left with 3s, turns right about to dance 3H round
  to right with 2s & ends facing 1s
17-24
: 4M dances RH across with 1s **while** 2s+3s dance 1/2 R&L, 4M dances LH
  across with 3s **while** 1s+2s dance 1/2 R&L
25-32
: 4M sets twice to 1s (3rd place) as 1L advances, giving RH she turns
  under 4M's arm back to place, 4M+1M change places RH & 1M faces 2nd pl