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Challenge

Write code that outputs TeX (LaTeX) math-equation code (given below) that will typeset Sierpinski Triangle Fractal of 5 levels. Shortest code wins.

Details

TeX (and friends like LaTeX, etc.) is a sophisticated typesetting system. It can render arbitrary nested complex expressions for mathematical formulas. Coincidentally this "nested complex" is also descriptive of fractals. The following is rendered with MathJaX

$${{{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}^{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}_{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}}^{{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}^{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}_{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}}_{{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}^{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}_{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}}}$$

by the following plain-text math-equation code consisting of nested super- and sub-scripts:

{{{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}^{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}_{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}}^{{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}^{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}_{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}}_{{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}^{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}_{{{x^x_x}^{x^x_x}_{x^x_x}}^{{x^x_x}^{x^x_x}_{x^x_x}}_{{x^x_x}^{x^x_x}_{x^x_x}}}}}

Note this is just a 5-level nesting. You do not need to generate $...$ or $$...$$ or other markup required to start/end a math equation in TeX & Co. You can preview generated TeX in many online editors, for instance: http://www.hostmath.com but you can find many others too. This question was inspired by a discussion with friends.

Update