For that, you need to enable this option: https://i.imgur.com/aFrcxmC.png
In that case, the synonyms work in both ways, as one set, so all definitions work backwards as well.
When that option is enabled, you can reduce the sets, like so: https://i.imgur.com/q0PF5Aq.png
Then, if you define a rule for example: cf4 => cfc4, cfj4, it means, the plugin will generate the following final rules (all keyword to keyword matches):
cf4 => cfc4, cfj4
cfc4 => cf4 , cfj4
cfj4 => cfc4, cf4 This can help greatly reduce the rules count, if you need all keywords in a group to work in every direction anyways.