('CID100005558', 6),Tribromomethane-d ('CID100005558', 6),Tribromomethane-13C ('CID100005558', 6),tribromomethane ('CID100005558', 6),Tribromomethane ('CID100005558', 6),Tribromomethane; methyl tribromide ('CID100005558', 6),tribromomethane ('CID100189881', 3),Hexamethylenetetramine, compd. with tribromomethane (1:1) ('CID100189881', 3),1,3,5,7-Tetraazatricyclo(3.3.1.13,7)decane, compd. with tribromomethane (1:1) ('CID100189881', 3),1,3,5,7-tetraazatricyclo[3.3.1.13,7]decane - tribromomethane (1:1) ldiff: defaultdict(, {'CID100005558': [2, 4, 0, 0, 19, 0], 'CID100189881': [42, 62, 51]}) f1: [2, 4, 0, 0, 19, 0] f2: [42, 62, 51] c1: Counter({0: 3, 2: 1, 19: 1, 4: 1}) c2: Counter({42: 1, 51: 1, 62: 1}) The chosen was ... CID100005558