('CID102758038', 1),2,6-Dibromo-4-methylisocyanide
('CID110953633', 1),Methylisocyanide, formyl-, diethyl acetal (8CI)
ldiff: defaultdict(<type 'list'>, {'CID102758038': [14], 'CID110953633': [31]})
f1: [14]
f2: [31]
c1: Counter({14: 1})
c2: Counter({31: 1})
The chosen was ... CID102758038