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Find the numeric mean of the prime numbers in a matrix.
Replace multiples of 5 with NaN
02 - Vector Variables 2
Change the first and last diagonal element of the identity matrix to zero
Rotate array 90 degrees
Probabilities - Balls and urns - 02
Non trivial identities - reshape
Find the diagonal of the square of side L
Non trivial identities - flipping
Probabilities - More brains than luck
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