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The citation for the opening sentence is no longer valid.
The opening sentence lists cinderblock as both a reinforcing material and an unreinforced material. I suppose this isn't an impossible situation, but at best it is an unclear example.
I don't have the time or the background knowledge to fix these issues but I hope someone else will!
14:58, 19 April 2019 (UTC) — Preceding unsigned comment added by 66.193.95.18 (talk)