{{explanation}}
2 chords - 2nd chord 3s & 4s cross to opp sides

1-2
: 1s & 4s 1/2 turn LH moving down/up 1 place **while** 2s & 3s cast
  to 1st/4th place. End 1M & 4M following partners who face 2M & 3M
  places.  2 (1) 4 (3)
3-8
: 1s+2s also 4s+3s dance tandem RSh reels of 3 across
9-16
: 1s+2M also 4s+3M dance RH across.  1s+4s dance LH across in centre
17-20
: 1s+3L also 4s+2L dance RH across to end on sidelines 2 (4) 1 (3) with 4L
  & 1L facing out
21-24
: 4s+1s chase anticlockwise 1/2 round in centre of set. All face in  2
  (1) 4 (3)
25-32
: All set.  1s+4s dance 3/4 R&L **while** 2s+3s cross RH, set, cross back
  LH. End 2 4 (1) (3), 4s & 1s facing out, 2s & 3s retaining hands to
  repeat from new positions