In this table, it has three columns. One for Characteristic Names, and two for Aptitudes.
In my digital copy of the rulebook, I only have a list of aptitudes under the third column, but not under the second. Column 1 being Characteristics, Column 2 being Aptitude 1 and column 3 being Aptitude 2.
So, if I want to increase a characters stats, I would always pay the extra experience for only having 1 aptitude in that particular characteristic. Is something missing from my rulebook?