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Ambiguity and variability in a dictionary.
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).
| 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 |
