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add d3.join()?
https://lookout.dev/rules/d3-prefer-join-over-enter-exit-or-merge https://observablehq.com/@philippkoytek/d3-part-3-selection-join-explained https://www.codementor.io/@milesbryony/d3-js-join-14gqdz3hfj
Step 2: create a new version of code/general_update_pattern.html using join(). (general_update_pattern2.html).