('CID106450800', 6),Artemether and lumefantrine
('CID106450800', 6),Artemether / lumefantrine
('CID106450800', 6),Artemether-Lumefantrine
('CID106450800', 6),Artemether-lumefantrine combination
('CID106450800', 6),Artemether-lumefantrine mixt
('CID106450800', 6),Lumefantrine - artemether mixt.
('CID105311253', 5),Lumefantrine
('CID105311253', 5),Lumefantrine
('CID105311253', 5),Lumefantrine (INN)
('CID105311253', 5),Lumefantrine [INN:BAN]
('CID105311253', 5),Lumefantrine (USAN/INN)
ldiff: defaultdict(<type 'list'>, {'CID105311253': [0, 0, 6, 10, 11], 'CID106450800': [15, 13, 11, 23, 16, 19]})
f1: [15, 13, 11, 23, 16, 19]
f2: [0, 0, 6, 10, 11]
c1: Counter({11: 1, 13: 1, 15: 1, 16: 1, 19: 1, 23: 1})
c2: Counter({0: 2, 10: 1, 11: 1, 6: 1})
The chosen was  ... CID105311253