| http://www.w3.org/ns/prov#value | - I.e. we do not *necessarily* have to use mattress encasements, with or without mattresses inside them, as one of the types of containers, though naturally it would be nice if that were feasible. (Also it is harder to open up a mattress encasement and count bugs, especially if there is a mattress in there as well, than it is to do so with jars, ziploc bags, etc..) The only difficulty would be acquirin
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