1-8
: 3s step in to form 2H arch as 1M followed by 1L chase down middle, 1s
  turn & 1L leads up t places ( 3s step back)
9-16
: 1s+2s dance RH across & LH back
17-24
: 1s+2s chase anticlockwise 1/2 way, 2s+1s set & 2s cross LH to own sides
  as 1s turn LH to face 1st corner
25-32
: 1s turn corners RH & RSh to face 2nd corner, turn corners RH & pass RSh
  to 2nd place own sides