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

1-8
: 1M+2s also 4M+3s dance 1/2 LSh reel, pick up partner in prom hold &
  continue for another 1/2 reel & end 2 1 (4)(3) - (1s facing 4s in
  centre)
9-16
: 1s+4s change with opposite person RH, 1/2 turn partner LH into LH across
  1/2 way & end facing corners
17-24
: 1s & 4s dance "Hello-goodbye" setting & end facing '2nd corner'
25-32
: 1s & 4s turn corners RH, pass other person RSh on sides & turn next
  corner RH to end 2 4 (1)(3)