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Full Lineage:
Cheung Ng (Tan Sao Ng) > Leung Yee Tai
Leung Yee Tai was said to have learned his Wing Chun from Cheung Ng also known as Tan Sao Ng where they were both involved within the Hung Suen / Red Boat Opera Troupe.
On the Yip Man side of the story, he learned from Wong Wah Boh and introducted the longpole to the system. Wong Wah bo introducted the butterfly swords.
Too much is legend, and conflicting, to know for sure his actual teachers and training.