5 4 10

ann 1 1 0 0 0
bob 1 0 0 1 0
cal 0 1 1 1 0
don 0 0 0 1 1 

Athens     0 1 1 2 2 
Brussels   1 0 1 1 1 
Cologne    1 1 0 1 1 
Dublin     2 1 1 0 1 
Edinburgh  2 1 1 1 0