1-8
: 1s dance down between 2s & cast back to top; 1s dance down between 3s &
  cast up to 2nd place (2s step up on bars 5-6).
9-20
: 2s+1s+3s dance R&L for 3 couples.
21-24
: 1s turn RH 1.1/2 to face 1st corners.
25-32
: 1s dance Corner Pass+Turn with 1st corners & Corner Pass+Turn with 2nd
  corners.  1s end facing down in the centre ready to repeat.  2 1 3

{{explanation}}
End of 2nd time through, 1s dance down centre to 4th place, 4s step up as new 1st couple begin