This doc uses Graphmark to share knowledge graph, which is visualized from bookmarks.
I appreciate any kinds of feedback. Thank you 
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Is this Coda, or an advertisement written in a Coda doc?
it doesn’t look like the doc is actually using graphmark. it is just a doc about graphmark.
On his profile is a pack published, so I assume he built a pack and created this as a demo doc for it.
Best regards
Jannis