SYLHETI (Basic Conversation) by Asif Adnan.
https://community-courses.memrise.com/community/course/731571/sylheti-basic-conversation/
Sylheti class by Kate Pline.
https://www.brainscape.com/packs/sylheti-2419893
Words with ɛ from Sylheti word initial vowels, by Nidaba lexicon analysis and comparison.
http://nidaba.co.uk/Contents/RetranscribedWords?sequenceSetId=&sequenceId=16589&parameterValueId=&listId=
Brief history of language trends from Syheti’s numbers by Sylheti Project SOAS (University of London) in Camden.
https://sylhetiproject.wordpress.com/2021/12/22/brief-history-of-language-trends-from-syhetis-numbers/