Part 4 of Ralph Griswold's code drafting series, describing how to build a code table tailored to a particular string rather than using a fixed table. Characters are assigned to shaft pairs according to how often they occur in the string, giving a balanced distribution. The worked example uses a line from Poe's poem Annabel Lee and compares the result with a table based on frequencies in large bodies of text. A pattern derived from the table appears at the end.