6. A method as claimed in claim 4 wherein: the number of said components in a character code defines a length number; said set defines standard sub-sets according to the length numbers of the standard characters, the members of a standard sub-set each having the same length number, each standard sub-set representing a different length number and each standard sub-set being ordered according to said complexity numbers of the standard characters in the standard sub-set; and, said portion of said set is specified according to the length and complexity numbers of the incoming character.
7. A method as claimed in claim 6 wherein said complexity number is obtained by counting the number of each type of element code in the character code yielding a stroke count number for each said type, adjusting each said stroke count number according to the reliability of the corresponding basic stroke element to yield a weighted stroke count for each element code, and summing the weighted stroke counts, to yield a complexity number.