Make a checkerboard matrix
Replace NaNs with the number that appears to its left in the row.
Number of 1s in a binary string
sum of non-primes
07 - Common functions and indexing 3
Raise each element to the power of its index in a matrix
Repetition of matrices
Percentage of zeros in a matrix of only 1s and 0s
Basics: counting digits of a number irrespective of the sign
Product of all elements in an array
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