('CID100067874', 1),alpha,alpha,alpha-Trifluoro-p-cresol
('CID100009816', 1),2-Nitro-alpha,alpha,alpha-trifluoro-p-cresol
ldiff: defaultdict(<type 'list'>, {'CID100067874': [0], 'CID100009816': [8]})
f1: [0]
f2: [8]
c1: Counter({0: 1})
c2: Counter({8: 1})
The chosen was ... CID100067874