('CID100439326', 2),DI(N-ACETYL-D-GLUCOSAMINE)
('CID100439326', 2),DI(N-ACETYL-D-GLUCOSAMINE)
('CID116750033', 1),DI(N-ACETYL-D-GLUCOSAMINE)
ldiff: defaultdict(<type 'list'>, {'CID100439326': [0, 0], 'CID116750033': [0]})
f1: [0, 0]
f2: [0]
c1: Counter({0: 2})
c2: Counter({0: 1})
The chosen was ... CID100439326