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Britney produced six singles. "I'm a Slave 4 U" reached the top ten in 20 countries but peaked only at number 27 on the US Billboard Hot 100, becoming Spears's first lead single not to peak within the top ten. "Overprotected" also achieved international commercial success but peaked only at number 86 the US Billboard Hot 100. "I'm Not a Girl, Not Yet a Woman", "I Love Rock 'n' Roll" and "Boys" reached the top ten in several countries but all failed to enter the US Billboard Hot 100, while "Anticipating" was released exclusively in France instead of "I Love Rock 'n' Roll". To further promote the album, Spears embarked on her fourth concert tour, titled Dream Within a Dream Tour, from November 2001 until July 2002.