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.
Inner product of two vectors
middleAsColumn: Return all but first and last element as a column vector
construct matrix with identical rows
04 - Scalar Equations 2
01 - Scalar variables
07 - Common functions and indexing 4
03 - Matrix Variables 1
02 - Vector Variables 5
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