An option to either merge all pdfs for the selected subject or send them individually.
In the future:
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To save time, keep merged copies stored locally (heroku doesn't allow saving to disk permanently, so might wanna look into storing it someplace else)
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When a merged pdf for a particular subject is requested, check if May or December has passed, and if it has, scrape the PDFs again and replace the previously merged pdf with a new one, accounting for new papers being uploaded on the site.