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

1-8
: 1s+4s set, cast down/up (2s+3s step down/up 3-4); 1s+4s dance 1/2 Fig 8
  round end couples. 2 (1) 4 (3)
9-16
: 1s+4s Set+Link; 1s+4s circle 4H round to left
17-24
: 2s+4s also 1s+3s Reverse Set+Link; 4s+2s also 3s+1s circle 4H round to
  right.  4 2 (3) (1)
25-32
: All dance "Double Helix":

: All set advancing passing partner LSh & pull back RSh & cast back to own
  side; all 1/2 turn partner RH, 4s+2s also 3s+1s dance 1/2 RH across.
  End 2 4 (1) (3)