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| test link | https://elk.zone/universeodon.com/@technicat |
| test mention | @pc |
| test | tag |
*test*
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more math
https://en.wikipedia.org/wiki/Pythagorean_theorem
\[
x^2 + y^2 = z^2
\]
https://en.wikipedia.org/wiki/Binomial_coefficient
\[
\binom{n}{k} = \frac{n!}{k!(n-k)!}
\]