Although any algorithm that produces a compact representation of the group of characters could be used, the following equation is used in step 772: E n = ( ??? i = 1 i = 20 t i p 20 - i ) mod M ( 1 ) In Equation 1 above, the potential exemplar, E, starting at array index, n, is calculated for each of the group of characters, ti, where p is a prime number and M is a constant.