('CID100001459', 1),FUDP
('CID100133318', 1),Fudp-glucose
ldiff: defaultdict(<type 'list'>, {'CID100001459': [0], 'CID100133318': [8]})
f1: [0]
f2: [8]
c1: Counter({0: 1})
c2: Counter({8: 1})
The chosen was ... CID100001459