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Levels of model 2 elements.
| Element | Reachability set | Antecedent set | Intersection set | Level |
|---|---|---|---|---|
| B1 | B1B2B4B7B8 | B1B2B5B6 | B1B2 | 2 |
| B2 | B1B2B4B7B8 | B1B2B5B6 | B1B2 | 2 |
| B3 | B3B4B7B8 | B3B5B6 | B3 | 2 |
| B4 | B4B7B8 | B1B2B3B4B5B6B7B8 | B4B7B8 | 1 |
| B5 | B1B2B3B4B5B6B7B8 | B5B6 | B5B6 | 3 |
| B6 | B1B2B3B4B5B6B7B8 | B5B6 | B5B6 | 3 |
| B7 | B4B7B8 | B1B2B3B4B5B6B7B8 | B4B7B8 | 1 |
| B8 | B4B7B8 | B1B2B3B4B5B6B7B8 | B4B7B8 | 1 |
