d block ppt

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https://docs.google.com/presentation/d/0B37pGFUy5hT7VjBGSDVZWW50am8/edit?usp=drive_link&ouid=107546006439993393545&resourcekey=0-CjkPktH6jV_lJbhpfDa4Jw&rtpof=true&sd=true 

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