('CID124801580', 1),Bevacizumab+Rituximab
('CID100009903', 1),Bevacizumab+Trastuzumab
ldiff: defaultdict(<type 'list'>, {'CID124801580': [10], 'CID100009903': [12]})
f1: [10]
f2: [12]
c1: Counter({10: 1})
c2: Counter({12: 1})
The chosen was ... CID124801580