A Friedel-Crafts acylation is an electrophilic aromatic substitution in which the electrophile (E⁺) is an acylium ion. There are other methods of forming acylium ions, such as treatment of an anhydride with a Lewis acid. The resulting acylium ion can also be attacked by a benzene ring, resulting in acylation of the aromatic ring. With this in mind, draw the mechanism of the following transformation:

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