| http://www.w3.org/ns/prov#value | - maining structure.Avoid leaving free-standing walls by reducing the building in small lifts.Never leave isolated walls or potentially unstable structures un-propped, unless they are stable against wind and other forces likely to affect them.When demolishing a reinforced concrete floor, it may be necessary to remove a small section first, in order to determine the direction of the main steel.Provid
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