('CID103037234', 3),IOPHENDYLATE
('CID103037234', 3),Iophendylate, o-
('CID103037234', 3),Iophendylate [USAN:BAN]
('CID105284576', 3),Iophendylate, m Iofendylate
('CID105284576', 3),Iophendylate, M Iofendylate
('CID105284576', 3),Iophendylate, m-
ldiff: defaultdict(<type 'list'>, {'CID105284576': [15, 15, 4], 'CID103037234': [0, 4, 11]})
f1: [0, 4, 11]
f2: [15, 15, 4]
c1: Counter({0: 1, 11: 1, 4: 1})
c2: Counter({15: 2, 4: 1})
The chosen was ... CID103037234