A laser array circuit decreases the size of a circuit pattern. A filter is applied to the un-compensated wobble patterns to pre-compensate the un-compensated wobble patterns. Based on the result of the judgment, the variable-length coding apparatus generates and outputs a code assigned to the combination. Moreover, the system and method compare the theoretical value with the practical value and to provide at least one measure in order to save fuel during a flight when the practical value differs from the theoretical value by a predeterminable amount. An embodiment of the chair may be telescopically stacked in a space-saving configuration of a plurality of identical chairs.