('CID124801580', 1),Bevacizumab+Rituximab
('CID100004742', 1),Iboctadekin & rituximab
ldiff: defaultdict(<type 'list'>, {'CID124801580': [12], 'CID100004742': [14]})
f1: [12]
f2: [14]
c1: Counter({12: 1})
c2: Counter({14: 1})
The chosen was ... CID124801580