Some programs are mind maping software, which is not what you want. You need concept mapping software, but I can only give you a list of both.

https://en.wikipedia.org/wiki/List_of_concept_mapping_software

Freeplane is a fork of FreeMind, and FreeMind seems to support this (https://upload.wikimedia.org/wikipedia/commons/7/70/Freemind-0.9x_Screenshoot.png), so maybe you should try it.

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