{{explanation}}
2s & 4s start on opp sides

1-8
: 1s+2s also 3s+4s dance RH across & LH back
9-16
: 1s+2s also 3s+4s dance Ladies' Chain to end 1s & 3s facing down, 2s & 4s
  facing up
17-24
: All dance LSh reels of 4 on sides
25-32
: All set to partner, dance 1/2 R&L & set
33-40
: 1s & 4s lead out nearer end of set, cross, cast 1 place & turn person
  approaching on side 1.1/2 times LH to end 2 (4) 1 (3)