CONTRA MADNESS
longways duple improper QUADRUPLE PROGRESSION
Gene Hubert, Dizzy Dances vol 2.

A1 Down the center, 4 in line, actives in center
      Don't turn around, just back up a few steps and actives arch while      
inactives  go under to meet a new couple
A2 Do-si-do the one you meet, then pass by and swing the next
B1 pass thru across the set (right shoulders with partner), turn alone (8)
     Right and left thru across the set with the convenient one (8)
B2 Lines go forward and back (8)
      Actives swing in the middle

"The progressions are pretty much automatic. The pass thru followed by a right
and left thru in B1 is a progression not seen much in traditional style
contras. The convenient one is, for the lady, the gent on your left, and for
the gent it is the lady on your right."