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I'm not sure, but we filmed Mak Yiu Mings students in China at the Ip Man Tong Opening and their Chum Kiu is the same. Cheung Bo Lineage I believe.

http://www.youtube.com/watch?v=XZc0Lyw385U

I find the opening salutation interesting, as it's similar to guys I have seen in Foshan.

As for the lineage, at this time I don't know but will fill you in if I find out! :)