Vocabulary sources & credits

Pack selection uses the English with Sakib working vocabulary collection. English and Bangla meanings are original editorial working glosses; independent linguistic review is pending. Teaching difficulty is provisional.

Frequency-guided selection uses wordfreq, copyright 2022 Robyn Speer. The adapted frequency-guided headword selection is shared under Creative Commons Attribution-ShareAlike 4.0. Changes: selection into disjoint learning packs, provisional difficulty grouping, and omission of basic function words. This data license does not apply to the website design or separately authored course materials.

wordfreq credits include Marc Brysbaert and the SUBTLEX authors, OpenSubtitles, Google Books Ngrams, Leeds Internet Corpus, Wikipedia, ParaCrawl and the sources retained in the complete wordfreq notice. SUBTLEX is freely available data. No third-party dictionary definitions, recordings or illustrations are copied into these pack previews.