What does this trick formula represent?

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Trick formula question...

Can someone tell me what this formula represents?

Nested square-root equation: ((((((x0^2 + x1^2 + x2^2 + x3^2)^1/2 - r1)^2 + x4^2)^1/2 - r2)^2 + x5^2 + x6^2)^1/2 - r3)^2 + x7^2 + x8^2 + x9^2)^1/2 - r4 = 0, where r1 = 10^38 x electron classical radius, r2 = 1/2 x electron classical radius, r3 = 1/206.85 x r2, r4 = 1/10 x r3.


Thanks
 

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