{{explanation}}
1s & 2s start on opp sides

1-8
: 1s & 4s set & cross RH into prom hold facing out of ends, 1s & 4s dance
  round to right round corner & pass LSh to face 3M/2M
9-16
: 4s+1s dance 1/2 diagonal reel of 4 with 2M/3M, 4s & 1s pass LSh to face
  3L/2L & dance 1/2 diagonal reel of 4 to end on sides (3)(1)4 2
17-20
: 3s facing 1s & 4s facing 2s on sides & set HS
21-24
: All pass facing person RSh & loop round to left (1s & 4s round dancer in
  next set or no-one, 3s & 2s round each other) to (1)(3)2 4
25-32
: All dance 1/2 reel of 4 on sides, 4s+2s & 3s+1s set facing on sides &
  dance RH across 1/2 way to end (2)(4)1 3