{{explanation}}
1s start on opp sides

1-8
: 1s facing 2s on sides set & change places RH, 2s+1s set to partner &
  cross RH
9-16
: 2s+1s repeat above Fig
17-24
: 1s lead down the middle & back to places
25-32
: 1s+2s dance Polka Poussette (1s end opposite sides to start again)