Test for randomness could be tightened (cf. Solution 1490988).
Basic arrays operations.
Number of digits in an integer
convert matrix to single column
07 - Common functions and indexing 4
04 - Scalar Equations 3
07 - Common functions and indexing 6
04 - Scalar Equations 1
05 - Vector Equations 1
07 - Common functions and indexing 3
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