{{explanation}}
2 chords  -  2nd chord 3s+4s cross to opp sides

1-8
: All 4 couples set, cross RH 1s+3s face down & 2s+4s face up, all set,
  change places LH on sides
9-16
: All set, cross RH 1s+4s face on sides, 1s+4s set, change LH on sides to
  flow into ..
17-24
: Reel of 4 on sides on bar 24 1s+4s pass RSh 2 (4) 1 (3)
25-32
: All set, 2s+3s chase clockwise to other end of set **while** 1s+4s dance
  3/4 R&L 3 1 (4) (2)