| http://www.w3.org/ns/prov#value | - Alternatively, the perforated mat can be placed in a breathing tube, such as the tube illustrated in FIG. 1B, or can be placed in an airflow treatment chamber, such as within the backpack of the configuration illustrated in FIG. 1B.In other embodiments, an element or block with a chamber can receive the environmental air and trap or stall the air.
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