('CID100076394', 2),Phthalicacid, 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]di- (7CI)
('CID100076394', 2),Phthalicacid, 4,4'-[trifluoro-1-(trifluoromethyl)ethylidene]di- (8CI)
('CID100084135', 1),Phthalicacid, cyclic oxydiethylene ester (8CI)
ldiff: defaultdict(<type 'list'>, {'CID100076394': [63, 57], 'CID100084135': [34]})
f1: [63, 57]
f2: [34]
c1: Counter({57: 1, 63: 1})
c2: Counter({34: 1})
The chosen was  ... CID100084135