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Find an equation of a parabola satisfying the given information. Focus $$( 0 , - 6 \pi )$$ , directrix $$y = 6 \pi$$ ,An equation for a parabola satisfying these conditions is $$\square$$ . (Type an equation. Type an exact answer, using $$\pi$$ as needed. Simplify your answer.)
$$x ^ { 2 } = - 24 \pi y$$