How was Obi-Wan trained by both Yoda and Qui-Gon?

Wampa: According to the New Essential Guide to Characters, Obi-Wan received Jedi tutelage from Yoda and other Jedi instructors. Eventually when Obi-Wan reached the age of thirteen, Qui-Gon chose Obi-Wan as his Padawan. More.

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