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You'll be fine with the cinderblock wall, as long as you use the product that have the plastic clips, and use a lot of glue. I recommend PL Premium, or a glue that is specifically for masonry.
Also, another tip for a raised patio - Make sure you compact the gravel using a heavy plate compactor or something similar (do not use a hand tamper) every 2-4" (that reads INCHES!!). It'll take quite a while to build up the gravel, but you'll be thankful when you're sipping a beer on your patio in 10 years and nothing has shifted.
Good luck
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Matt Blanche
Epic Interlock and Landscape
www.epicinterlock.com
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