There is no mention of Abbie having a sister in the widely known educational materials and resources associated with the term "Fundamental Paper Education." This phrase itself is quite broad and doesn't refer to a specific book, curriculum, or character-driven story. It's possible:
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You're misremembering the name or source: Perhaps you're thinking of a different book, story, or educational resource. Could you provide more details, such as the title of the book, the author's name, or any other identifying information? This would greatly help in identifying the source and answering your question.
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Abbie is a character in an obscure or unpublished work: If "Fundamental Paper Education" refers to a specific, less widely known educational material, it's possible that information about Abbie and her family is only available within that specific resource.
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The phrase is misinterpreted: The phrase "Fundamental Paper Education" is generic and could apply to various contexts. A more specific descriptor would be helpful.
To help me assist you further, please provide additional context. Knowing the specific source where you encountered "Abbie" will allow me to research and provide a definitive answer.