Which language learning product first introduced the revolutionary 'spaced repetition system' (SRS) for vocabulary acquisition that became a standard feature in modern language learning apps?

Throughout history, certain language products have revolutionized how we communicate, learn languages, and process linguistic information. These tools have shaped our approach to language acquisition and usage across cultures. Test your knowledge about a groundbreaking linguistic product that transformed the industry and set new standards for language learning and translation.

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Rosetta Stone (1992)
SuperMemo (1987)
Duolingo (2011)
Pimsleur Language Programs (1963)