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The battle for Mosul is entering its final and most challenging phase, with Iraqi forces there engaged in the most intensive urban warfare since World War II. The Times embeds with one Iraqi unit. Guests: Ben C. Solomon, a video journalist who has been following Iraqi fighters in Mosul; Adam Liptak, who discusses the Supreme Court\u2019s decision to consider whether partisan gerrymandering violates the Constitution. Caitlin Dickerson is our host; Michael Barbaro is on vacation. For more information on today\u2019s episode, visit http://nyti.ms/2twhjwL.