Method for testing a memory under test including a plurality of memory cells and a Memory Built-In Self-Test Engine connectable to a memory under test. The periphery preferably is sized to be substantially coextensive with the front of the speaker housing or cabinet. When the switch is rotated into the recirculation line, a hose is in fluid connection through the switch and connects the recirculation line with the pump blood and drug inlet lines thereby allowing cooling of the cardioplegic mixture during the time between infusions. A fastener with a spherical portion on the fastener head extends into the hole with the spring members urged apart to allow the head to pass but restraining removal until the resistance provide by the spring members is overcome. When all of the elements of a trade template are satisfied, the corresponding orders may be matched contemporaneously.