It looks like I forgot to put in size(x,2) instead of 4. Apparently the test suite didn't check that.
Finding Perfect Squares
2 b | ~ 2 b
Vectorize the digits of an Integer
Min of a Matrix
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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