('CID100040976', 6),Etonogestrel
('CID100040976', 6),ETONOGESTREL
('CID100040976', 6),Etonogestrel (USAN/INN)
('CID100040976', 6),ETONOGESTREL
('CID100040976', 6),Etonogestrel (USAN/INN)
('CID100040976', 6),Etonogestrel [USAN:INN]
('CID100208920', 4),Etonogestrel and ethinyl estradiol
('CID100208920', 4),Etonogestrel-ethynylestradiol mixt.
('CID100208920', 4),ETONOGESTREL
('CID100208920', 4),Ethinyl estradiol and etonogestrel
ldiff: defaultdict(<type 'list'>, {'CID100208920': [22, 23, 0, 22], 'CID100040976': [0, 0, 11, 0, 11, 11]})
f1: [0, 0, 11, 0, 11, 11]
f2: [22, 23, 0, 22]
c1: Counter({0: 3, 11: 3})
c2: Counter({22: 2, 0: 1, 23: 1})
The chosen was ... CID100040976