Estimate Pi as described in the following link: http://www.people.virginia.edu/~teh1m/cody/Pi_estimation1.pdf
please update the link to the document, cant find it anymore
The link is broken, but you can solve this problem with the Leibniz formula for π.
Sums with Excluded Digits
Set the array elements whose value is 13 to 0
Detect a number and replace with two NaN's
Swap two numbers
Pi Estimate 2
Linear system solve
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