{{explanation}}
3s & 4s on opp sides

1-8
: All set, 1s & 4s cross down/up **while** 2s & 3s cast up/down, 2s+1s
  also 4s+3s turn on sides (LH on Ladies' side & RH on Men's side)
9-16
: 2L,1M, 4M & 3L dance Ladies' Chain (diagonally)
17-24
: All chase anticlockwise 1/2 way & 3s+4s also 1s+2s all turn RH on sides
25-32
: 3M,4L,1L & 2M dance Ladies' Chain (diagonally)
33-40
: 1s+4s set, dance RH across 1/2 way, set & cross RH. 3 1 (4)(2)