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

1-8
: All dance reels of 4 on sides but middle couples do not pass LSh & end
  turning about to face corners.  1 3(2)(4)
9-16
: 1s+3s also 2s+4s dance R&L starting RH on sides. At end 3s & 2s remain
  in centre facing partners joining 2H ready for ...
17-24
: 3s+2s dance poussette
25-32
: 2s & 3s dance 1/2 Figs of 8 round end couples, all turn partners RH &
  end in middle 1s+2s facing up 3s+4s down.  1 2(3)(4)
33-40
: All dance interlocking Allemandes:

: 1s & 2s dance normal Allemande but end in 3rd/1st places **while** 3s+4s
  Allemande (down) & up to 4th/2nd places to end 2(4)1(3)