Do you guys understand what you're reading though?
Quote:
In a final feel-good note, two of the four tracks that vacated the Top 10—Lorde’s “Royals” and Perry’s “Roar”—were seamlessly replaced by the same artists’ follow-up singles (Team and Dark Horse).
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To follow means to "come after". Chronilogically Roar came first, then Unconditionally, then Dark Horse, thus Dark Horse is a "follow-up" single to Roar.