('CID100003312', 10),etretinate
('CID100003312', 10),Etretinate
('CID100003312', 10),etretinate
('CID100003312', 10),etretinate
('CID100003312', 10),etretinate
('CID100003312', 10),13-cis-Etretinate
('CID100003312', 10),etretinate
('CID100003312', 10),Etretinate
('CID100003312', 10),Etretinate (JAN/USAN/INN)
('CID100003312', 10),Etretinate [USAN:BAN:INN:JAN]
('CID100041317', 6), 13-cis-Etretin
('CID100041317', 6),Retinoid etretin
('CID100041317', 6),Etretin
('CID100041317', 6),Retinoid etretin
('CID100041317', 6),13-cis-Etretin
('CID100041317', 6),Etretin
ldiff: defaultdict(<type 'list'>, {'CID100041317': [5, 6, -3, 6, 4, -3], 'CID100003312': [0, 0, 0, 0, 0, 7, 0, 0, 15, 19]})
f1: [0, 0, 0, 0, 0, 7, 0, 0, 15, 19]
f2: [5, 6, -3, 6, 4, -3]
c1: Counter({0: 7, 19: 1, 15: 1, 7: 1})
c2: Counter({6: 2, -3: 2, 4: 1, 5: 1})
The chosen was  ... CID100041317