('CID122834577', 4),Nesiritide
('CID122834577', 4),NESIRITIDE
('CID122834577', 4),Nesiritide Recombinant
('CID122834577', 4),Nesiritide [USAN:INN]
('CID144150366', 3),Nesiritide
('CID144150366', 3),Nesiritide Acetate
('CID144150366', 3),Nesiritide citrate
ldiff: defaultdict(<type 'list'>, {'CID144150366': [0, 8, 8], 'CID122834577': [0, 0, 12, 11]})
f1: [0, 0, 12, 11]
f2: [0, 8, 8]
c1: Counter({0: 2, 11: 1, 12: 1})
c2: Counter({8: 2, 0: 1})
The chosen was  ... CID144150366