A machine-implemented, simulations-supporting system creates a hierarchy of data structures for simplifying the task of identifying iso-topological, and iso-geometric, and iso-static instances of subcircuit-definitions. A lip protrudes from the outer end of at least one of the tube sections. The memory devices can receive a shared enable signal. The method is useful for humans who are operating vehicles or machinery, who are suffering from cardiovascular disease or related complications, who are pregnant, or who are preparing for sleep. A reducing agent pump is arranged inside the first accommodating space.