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Sources
Books:
Open Library
Where Word Bank finds books and their covers.
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Definitions:
Wiktionary
Where word meanings and example sentences come from.
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Suggestions:
Datamuse
Where the app gets word suggestions.
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Translation:
Google Translate
The unofficial Google Translate endpoint used for the book screen's optional "Translate to" word lookup — free and keyless, but undocumented.
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