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forked from lydiawawa's block: group bar
forked from GerardoFurtado's block: group bar
forked from lydiawawa's block: group bar final
forked from lydiawawa's block: group bar with toggle
https://code.jquery.com/jquery-3.4.0.min.js
https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js
https://d3js.org/d3.v4.min.js