B14 has a few words on the matter, but those paragraphs are subject to a lot of arguments in the fandom.
Also:
Quote:
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Originally Posted by Power Ups 2: Perks, page 21
Attributes: Special Exercises (DX), Special Exercises (IQ),
and Special Exercises (HT) come in levels, with each level let-
ting you exceed the racial norm in that score – 20, for a human
– by one.
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