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| Bases | First | Second | Third |
|---|---|---|---|
| Relative frequency | 0.5 | 0.1 | 1 |
| Transition weighting | 2 | 5 | 1 |
| Combined weighting for | |||
| transitions ψS | 1 | 0.5 | 1 |
| transversions ψV | 0.5 | 0.1 | 1 |
