For any telephone service subscriber, local services could be offered based on either the packet switched next generation network or the PSTN network. The techniques may be performed by a video encoder in order to convert two-dimensional video to three-dimensional video. For operation of a hearing aid in accordance with the invention, in addition to the hearing aid itself, no further technical aids such as remote control, magnets etc. The outer shell defines a combustion chamber. Kits for designing and making compositions with desired haptens are also described.