Test for randomness could be tightened (cf. Solution 1490988).
Angle between two vectors
Determine Whether an array is empty
Find nearest prime number less than input number
find radius of cone
Concatenate two strings
01 - Scalar variables
07 - Common functions and indexing 5
07 - Common functions and indexing 2
02 - Vector Variables 3
03 - Matrix Variables 2
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