{{explanation}}
4 dancers in square numbered clockwise from 1M position

1-8
: 1 & 4 dance 1/2 Fig of 8 round 2/3 (4 passing in front of 1) to change
  places & dance 1/2 R&L (up/down to start) to end 3 1 4 2
9-16
: 3+1 also 2+4 Set+Link & continue turn to end in line of 4 up/down &
  dance 1/2 reel of 4 to end 2 4 3 1 up/down set
17-24
: All set advancing towards & pass facing person, 2+1 turn 3/4
  2H **while** 4+3 dance clockwise 1/4 to form line of 4 across, all set
  advancing towards & pass facing person, 3+4 turn 3/4 2H **while** 2+1
  chase clockwise 1/4 to end 2 4 3 1 up/down set
25-32
: 2+4 also 3+1set & 3/4 turn 2H to end with 2+4 at top facing up & 3+1
  facing down, all dance in & cast to end 2 4 1 3