Which language learning company or product used the slogan 'The fastest way to learn a language guaranteed®' as part of their brand identity?

Test your knowledge of famous language-related brand slogans that have shaped corporate identities in the linguistics and language learning industry. These taglines have helped define how we perceive language education products and services. Some have become so iconic that they've influenced how people think about language learning altogether. Can you identify which company or product is associated with each famous slogan?

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Pimsleur
Rosetta Stone
Babbel
Berlitz