('CID100113556', 2),O1-PENTYL-MANNOSE
('CID100113556', 2),O1-PENTYL-MANNOSE
('CID142627788', 1),O1-PENTYL-MANNOSE
ldiff: defaultdict(<type 'list'>, {'CID142627788': [0], 'CID100113556': [0, 0]})
f1: [0, 0]
f2: [0]
c1: Counter({0: 2})
c2: Counter({0: 1})
The chosen was ... CID100113556