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// Collapse/expand a sub-cell's input area by setting the its `hidden` state (NOTE: a collapsed input area will still appear collapsed!!! Only when a user clicks on the collapsed cell ellipses will the input area display (or, rather, not display!) as being fully hidden. If we want an input area to always be present, e.g., to always allow a user the ability to edit an expanded section, whether or not generated sections are collapsed or expanded, we could remove the following line.):
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