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Table 1 Ambiguity and variability in a dictionary.

From: Normalizing biomedical terms by minimizing ambiguity and variability

Concept ID Term
1 IL2
1 IL-2
1 Interleukin
2 IL3
2 IL-3
2 Interleukin
3 ZFP580
3 ZFP581
3 Zinc finger protein
This is an imaginary dictionary consisting of three concept IDs. All terms belonging to the same concept ID are assumed to be synonymous (conveying the same meaning).