sentences: if the waste of something metric then more of that something will have to be produced
docs: rubbish is waste. waste_of_material is waste. waste_of_effort is waste. garbage is waste_material. collection_test_metric is test_metric. metric_system is metric_unit_of_measure. washer is tangible_thing. waste_of_money is waste. figure_of_merit is efficiency. waste is material.