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

1-8
: 1s+2s also 3s+4s dance RH across, 2s+3s dance 1/2 R&L
9-16
: All dance RSh reels of 4 on sides
17-24
: 1L+3L also 2L+4L cross passing partner LSh & dance down/up side to
  change places, 1M+3M also 2M+4M cross passing partner RSh & dance
  down/up side to change places.  2 4 1 3
25-32
: All circle 8H round & back