Find perfect placement of non-rotating dominoes (easier)
Rotate input square matrix 90 degrees CCW without rot90
intersection of matrices
Duplicate a character
Swap two numbers
Duplicate each element of a vector.
A quadrant matrix
vectorization in N
Create a matrix X, where each column is a shifted copy of the vector v
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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