Users may prefer to use semantic complements like in Discourse Graph (supports and supported by)
supports
supported by
This could be done by creating a special reserved relationship called complements, and allowing a user to create a complement as follows
complements
- [[supports]] - [[complements]] -> - [[supported by]]
and now the plugin can treat the following two aspects as equivalent
- [[some evidence]] - [[supports]] -> - [[a claim]]
- [[a claim]] - [[supported by]] -> - [[some evidence]]