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ylla's Dewey Decimal Section:
523 Specific celestial bodies & phenomena
ylla = 5221 = 522+1 = 523
Maths, astronomy, prehistoric life, plants and animals.
What it says about you:
You are fascinated by the world around you, and see it as a puzzle worth exploring. You try to understand how things work and how you can make them better. You might be a nerd.