Covering some basic topics I haven't seen elsewhere on Cody.
Return the class of the input variable.
Right and wrong
First non-zero element in each column
Spot the outlier
Concatenate two strings
Produce a cosine wave
Back to basics 23 - Triangular matrix
Back to basics 9 - Indexed References
Back to basics 1 - Saving
Valid Chess Moves
Back to basics 21 - Matrix replicating
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