1-8
: All couples follow 1s leading down & cast up round 4th place to original
  places
9-16
: 1s+2s dance RH across twice as 3s+4s dance LH across twice
17-28
: All dance Grand Chain
29-32
: All Advance+Retire
33-40
: 1s weave down own sides to 4th place, dancing between 2s to start,
  behind 3s, in front of 4s, curving into 4th place (2s+3s+4s step up
  39-40)