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function Blocks (blks)
-- verify that this looks like a `pandoc.List`
if not blks.find or not blks.map or not blks.filter then
error("table doesn't seem to be an instance of pandoc.List")
end
-- return plain block containing the number of elements in the list
return {pandoc.Plain {pandoc.Str(tostring(#blks))}}
end
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