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Chi Sau is the most important part of the system. Chi Sau is not a form of kata. Chi Sau is not a form of sparring. Chi Sau is the bridge between techniques from the forms and real fighting. The forms are always the same. Chi Sau is free development. Every session is different.
What's a Chiasm? A chiasm (or chiasmus if you rather) is a writing style that uses a unique repetition pattern for clarification and/or emphasis. Chiasm is pronounced kyâ²-az-um. Often called the chiastic (kyâ²-az-tic) approach or the chiastic structure, this repetition form appears throughout the Bible yet it is not well known.