WIP: Prelim use #2

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alexm wants to merge 26 commits from prelim-use into main
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@@ -749,7 +749,7 @@
#for group in study [
#block(breakable: false, above: entry-gap)[
== #markup(group.text)
=== #markup(group.text)
#for reading in group.readings [
#block(inset: (left: 0.8em), above: step)[