Sigh! There should really be some quality control on Cody, to save us from stupid problems like this...
The third element of aVec in the the image contained within your problem description does not match the third element of aVec used in the test suite.
How to subtract?
Make a random, non-repeating vector.
Generate pi using logarithm
length of a vector
03 - Matrix Variables 5
02 - Vector Variables 2
01 - Scalar variables
07 - Common functions and indexing 3
06 - Matrix Equations 3
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