| Search algorithm | Number of selected attributes | Numbers |
| PSO | 1, 9, 10, 16, 21, 23, 24, 25, 26, 27, 30, 31 | 12 | Evolutionary search | 1, 3, 9, 10, 11, 15, 23, 24, 25, 26, 27, 29, 30 | 13 | Genetic algorithm | 1, 7, 9, 10, 16, 21, 23, 24, 25, 26, 29, 30 | 12 | Best first | 1, 4, 9, 10, 16, 21, 23, 25, 26, 27, 29, 30 | 12 |
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