A method and apparatus for vending a containerized fluid includes placing a machine-readable indicia on the container identifying the base fluid. The disabler circuit includes a switch electrically coupled to an input voltage and to ground. The invention has a wide spectrum of applications including reducing or eliminating tissue ishemica associated with a myocardial infarct. Efficient hash based access structures on relations can be used for symbolic array addressing, enabling fast computation of formulas. Also, packaged solid state light emitters and methods of lighting.