('CID106477692', 2),SP2456
('CID106477692', 2),SP2456
('CID100447945', 1),SP2456
ldiff: defaultdict(<type 'list'>, {'CID100447945': [0], 'CID106477692': [0, 0]})
f1: [0, 0]
f2: [0]
c1: Counter({0: 2})
c2: Counter({0: 1})
The chosen was ... CID106477692