('CID100130442', 2),METHYL-O3-(ALPHA-D-MANNOSE)-ALPHA-D-MANNOSE
('CID100130442', 2),METHYL-O3-(ALPHA-D-MANNOSE)-ALPHA-D-MANNOSE
('CID100002108', 1),METHYL-O3-(ALPHA-D-MANNOSE)-ALPHA-D-MANNOSE
ldiff: defaultdict(<type 'list'>, {'CID100002108': [0], 'CID100130442': [0, 0]})
f1: [0, 0]
f2: [0]
c1: Counter({0: 2})
c2: Counter({0: 1})
The chosen was ... CID100130442