1-8
: 1s set twice to 2L, set twice to 2M
9-16
: 1s dance Figs of 8 round 2s+3s on own sides (dancing between 2s to
  start)
17-24
: 1s & 4s advance (down/up), set, circle 4H round to left ending
  in 2nd/3rd places
25-32
: 2s & 3s repeat all ending in original places
33-40
: 1s+2M dance RH across; 1s+3M dance LH across
41-48
: 1s+4L dances RH across & 1s turn 2H to 4th places