Sort complex numbers into complex conjugate pairs.
Input x = [3-6i -1-4i -1+4i 3+6i]
Sorted output = [-1 - 4i -1 + 4i 3 - 6i 3 + 6i]
Make a checkerboard matrix
Which values occur exactly three times?
Volume of this donut
Say something funny
Change the first and last diagonal element of the identity matrix to zero
Change the sign of even index entries of the reversed vector
Duplicate a character
Remove entire row and column in the matrix containing the input values
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