{{explanation}}
1s & 3s start on opp sides

1-8
: 1s+4s dance RH across (2s & 3s step up/down), 2s+3s dance RH across (1s
  & 4s step up/down) all end in original places
9-16
: 1s+2s & 3s+4s dance 3/4 RH across & chase (2M leading down Ladies side
  & 3M leading up on Men's side), 1s+2s & 3s+4s dance 1/4 RH across to
  end 4 3 2 1 with 4s & 2s on opp sides
17-20
: 1s & 4s set advancing & turn right about to face corners (3s & 2s having
  stepped up/down)
21-32
: All dance double diagonal reels of 4 & 1s, 4s end by curving back to
  sides to end 3 (4) 1 (2)
33-48
: All dance Grand Chain (2 bars per hand)