{{explanation}}
2 chords - 2nd chord 3s & 4s cross to opp side

1-8
: 1s+4s dance RH across (2s & 3s step up/down), 2s+1s & 4s+3s face on
  sides; all set, 2s+1s & 4s+3s change places RH. 1 2 (3) (4)
9-16
: 1s+4s chase clockwise 1/2 round **while** 2s+3s dance LH across; 2s & 3s
  dance out of ends & cast back to place. 4 2 (3) (1)
17-24
: All set on sides; 4s+2s (at top) also 3s+1s (at bottom) dance 3/4 R&L (6
  bars - no polite turn). 2 4 (1) (3)
25-32
: 2s+4s+1s+3s circle 8H round & back. 2 4 (1) (3)