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http://www.fullbodyburn.com/html/flutes/ocarina_fingerings.htm

There are three fingering charts there.
Ignore the first and third.
The middle one might be what you want.

The two holes on the left are the thumbs. Black means covered up. White
means open.

With almost any such rustic flute, instruments might be slightly different
from each other and one fingering chart might not work for all of them, but it
will give you an idea.

Sandra