There is provided a heat pump system including two, at least similar units in fluid communication with each other, each unit having a housing, a first airbrine heat exchanger, a second brinerefrigerant heat exchanger, a brine inlet for applying brine onto at least one of the heat exchangers, a brine reservoir and a pump for circulating the brine from the reservoir to the inlet. The data is encrypted using the second encryption information and third encryption information. An event window, displayed on a monitor, has at least two cells for receiving a user input pertaining to an action of the subject in the activity. Then, based on indications of which source keys do not have matching reference keys, specific data blocks are transmitted from the source file corresponding to the unmatched source keys. In one embodiment, the bias conditions for the string during each individual erase are selected so that every memory cell of the set will experience similar capacitive coupling effects from neighboring transistors. The first processing means and the second processing means operate in parallel for the same bit plane of the same code block.