{{explanation}}
Each couple dance 32 bars. A New Couple starts after 16 bars (ie on bars 1, 17, 33 & 49)

1-8
: 1s+2s+3s dance reels of 3 on sides (1s in & down to start)
9-16
: 1s cross RH, cast 1 place, cross LH & cast down 1 place
17-24
: (New Couple starts as at bar 1) New couple starts reels of 3 on sides
  (new top couple in & down to start with original 1s in 3rd place)
25-32
: Original 1s+4s facing each other on sides set & change places with
  nearer hand (1s dancing out), set again to each other & 1s set to
  partner **while** new couple dance bars 9-32