('CID100197672', 2),BB87 Collagenase inhibitor
('CID100197672', 2),Bb87 Collagenase Inhibitor
('CID100097052', 2),Collagenase-Substrate Test Substance (for quantitative Collagenase-Determination)
('CID100097052', 2),Collagenase-Substrate Test Substance (for quantitative Collagenase-Determination)
ldiff: defaultdict(<type 'list'>, {'CID100097052': [70, 70], 'CID100197672': [15, 15]})
f1: [15, 15]
f2: [70, 70]
c1: Counter({15: 2})
c2: Counter({70: 2})
The chosen was ... CID100197672