note: 3c does not move on bars 1-8.
3c+4c cross on 2nd chord(1,2,3x,4x). This dance has top/bottom symmetry
Note: Cosh explicitly tells 1c to pass Lsh in [9-24]; however the Rsh pass is quite common, and nicknamed »Mairi's Divorce«.
In 17-32, the corners traditionally set one bar to the person you just passed, then one bar to the next person to pass. In a variant for [19-24] 1c turns BH in PdB.