These guidebooks are full of inconsistencies.
All traits are trade-offs - there is no single trait that reduces intellect or one that increases it like in a video game's character creator.
This particular one makes it more difficult to manage potential for intellect - but your top 1% outliers will also often have shape 1 or a hybrid between 1 and 2, especially in females.
Besides, reading isolated features rarely ever gives accurate results, and if physiognomy was so simple - anyone would get accurate results and it wouldn't be considered pseudoscience by the majority of people.
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