1-8
: 1s dance down the middle & back up on own sides
9-16
: All dance a Grand Chain
17-24
: 1s+2s & 3s+4s set & dance RH across 1/2 way, set & dance LH across back
  to places, 1s facing down, 2s+3s+4s face up

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Authentic version

25-32
: 1s make arch & dance down 1 place 2s dance under & up, repeat with 3s
  then 4s then 4s+1s turn LH
33-40
: 1s & 4s lead up to top, 1s casting to 4th place & 4s casting to 3rd
  place

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Popular variation

25-32
: 1s dance set advancing to right & in to 2nd place as 2s dance out to
  their right & up to 1st place, repeat with 3s then 4s, all turn RH
33-40
: 1s lead up to top followed by 4s+3s+2s (who start by dancing down to
  follow 1s) & cast back to places. 2 3 4 1