Radiotracer vorozole compounds for in vivo and in vitro assaying, studying and imaging cytochrome P450 aromatase enzymes in humans, animals, and tissues and methods for making and using the same are provided. In addition, a related system, computer program, and computer program product are also described. A method of friction welding is also disclosed. Still further, the method may include comparing the multi-digit entry numbers for each entry to the multi-digit drawing numbers for the occurrence of the lottery game, and determining whether each entry is a winning entry based on the level of correspondence between entry numbers and the drawing numbers.