('CID105325675', 2),L-RHAMNITOL
('CID105325675', 2),L-RHAMNITOL
('CID100219698', 1),2,5-Methylene-d,l-rhamnitol
ldiff: defaultdict(<type 'list'>, {'CID100219698': [16], 'CID105325675': [0, 0]})
f1: [0, 0]
f2: [16]
c1: Counter({0: 2})
c2: Counter({16: 1})
The chosen was ... CID105325675