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

1-8
: 1s & 4s cross RH & cast in 1 place to join hands to form a circle, set
  twice turning right about to face nearest corner
9-16
: 2s & 3s dance full diagonal RSh reels of 4 giving LH in
  centre **while** 1s & 4s dance 1/2 diagonal RSh reel & pass LSh in
  centre to face next corner anticl'wise; dance 1/2 RSh reel with that
  corner & pass LSh in centre to face next corner anticlockwise
17-24
: 4s & 1s turn corners RH & dance LH across 1/2 way, turn diagonally
  opposite corners RH & 1s+4s change places LH on the sides
25-32
: All dance RSh reels of 4 on sides.  2 4 (1)(3)