Which values occur exactly three times?
Rotate a Matrix
Rotate input square matrix 90 degrees CCW without rot90
07 - Common functions and indexing 1
Sum the 'edge' values of a matrix
Reindex a vector (★★)
Vector of digits (★★)
Fill a zeros matrix (★★★★★)
Swap the first and last columns (★★)
Sum of elements in a vector (★)
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