I was introduced to bunkai at one of Iain's seminars last year and have been studying it quite intensely since that time. I have also been trying to read some historical karate books for reference and recently finished Funakoshi's Karate-Do Kyohan. While reading the explanation of the forms I was struck by the very elementary explanations of bunkai for the katas. As an example, here are some explanations for heian nidan:
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