| to insecticides | 13 | other |
| to certain medications | 11 | other |
| to them | 8 | transitive-object |
| flea → be → resistant | 25 |
| flea → become → resistant | 21 |
| flea → develop → resistance | 18 |
| flea → developed → resistance | 6 |
| negative | neutral | positive |
| 0.491 | 0.406 | 0.103 |
| Raw frequency | 70 |
| Normalized frequency | 0.939 |
| Modifier score | 0.690 |
| Perplexity | 226.107 |