A garbage collector for reclaiming computer-memory space occupied by unreachable data objects operates incrementally in accordance with the train algorithm. In general, an ester reagent ROR\u2032, wherein R\u2032 is a tertiary group and R comprises a functional group X, is reacted with a water soluble, non-peptidic polymer POLY-Y, where Y is a functional group which reacts with X to form a covalent bond, to form a tertiary ester of the polymer, which is then treated with a strong base in aqueous solution, to form a carboxylate salt of the polymer. The axis of the lock is positioned transversely to the longitudinal axis of the weapon. The defibrillation threshold represents an energy that when delivered at the first internal thoracic location creates an electric field strength in the target region of the heart that meets or exceeds the target electric field strength. The telephone has a key and a controller which connects the telephone to the base answering machine of the base station in response to activating the key for a first period of time, and connects the telephone to the network answering machine of the network in response to activating the key for a second period of time. For example, the former mask may be shortened based upon the location of the least significant bit containing a one in the masked address.