One antonym is Tyranny.
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It's purpose is specialization of spore produce.

1) x=9, because we can use the Pythagorean theorem, x^2 + 144 = 225, x^2 = 81
2)
, because 6^2 +6^2 = 72, 
3)
, because 
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PURE TABOO IS AN ADULT TIME STUDIO