29. The system of claim 28 , wherein the seven levels of the scale are separated into a first group and a second group, wherein the first group consists of three levels beginning with the key and includes every other level until three levels are reached, wherein the first group is comprised of all even numbered levels if the key is an even number level or the first group is comprised of all odd numbered levels if the key is an odd number level.
28. The system of claim 27 , wherein each of the plurality of sets comprises a scale comprised of seven levels.