| Relationship | Method(s) |
|---|---|
| Leadend/halflead variant | Phoenix Doubles |
| Reverse | Reverse Paradox Doubles |
| EP1-1 | [Unnamed] Singles, Triples, Caters, Cinques, Sextuples, Septuples, Octuples, Nonuples, Decuples, Twenty-Three |
| EP1-4 | [Unnamed] Triples, Caters, Cinques, Sextuples, Septuples, Octuples, Nonuples, Decuples, Twenty-Three |
| EP4-1/0:0:1 | [Unnamed] Triples, Caters, Cinques, Sextuples, Septuples, Octuples, Nonuples, Decuples, Twenty-Three |