Hi,
I love your tool - it's something I intended to build, but I'm mainly a backend/python dev and rubbish at UI.
I could use your tool out of the box if it had one feature: the ability to show the graphs on a restricted / limited set of vocabulary:
that's the vocabulary I am incrementally learning!
You see I'd like to explore the relationship between words and characters I have learnt already - and not new / unknown ones.
Could your tool implement this "filtering" feature?
It would be really powerful.
Thanks a lot.