Compounds of the formulawherein the substituents are as defined in the specification which are useful for the treatment of pain. The flexible bladder is movable from a collapsed position wherein the bladder is folded into a substantially flattened state to an expanded position wherein the bladder forms a water treatment chamber. The polyamide elastomer can be a polyester amide, a polyether ester amide or a polyether amide, and is preferably a nylon block copolymer. Let Lx be the lossless encoded data length, and Ly be the lossy encoded data length. When processing determines that a particular telephone call has reached a usage limit, processing terminates the telephone call. Several threshold voltage distributions of the programmed memory cells could be overlapped with each other.