('CID113156776', 1),Caprylicacid, a-ethyl-a-methyl- (4CI)
('CID100128859', 1),Caprylicacid, b-oxo- (4CI)
ldiff: defaultdict(<type 'list'>, {'CID113156776': [25], 'CID100128859': [14]})
f1: [25]
f2: [14]
c1: Counter({25: 1})
c2: Counter({14: 1})
The chosen was  ... CID100128859