| http://www.w3.org/ns/prov#value | - You can???t just go to the CVS or Home Depot.??? For instance, it was quite an ordeal gaining approval from inspectors for the ???rst-ever use of nontoxic, long-lasting and recyclable polypropylene water pipes in a DC home. ???Three-quarters of the money we???ve spent is behind the walls,??? Levin jokes, referring to those pipes as well as two types of insulation, one soy-based and the other forme
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