The description of the problem is slightly misleading. It says the sum "below" 10, yet the sum includes 10. It should be ammended to "Find the sum of all the non-primes below the input, and including the input, N.", or something to that effect.
I've now fixed the problem statement to be consistent.
Find relatively common elements in matrix rows
Whether the input is vector?
Get the length of a given vector
multiply by three
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