Using the table playground.views, write a SQL query to identify all viewers who viewed more than one article on the same day. The table includes columns viewer_id (the ID of the viewer), article_id (the ID of the article viewed), and view_date (the date of the view). The result should contain a single column named viewer_id, listing each viewer who meets the criteria without duplicates, and should be sorted in ascending order of viewer_id.
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