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The third element in the test-suite does not match the image in the problem description.
Remove all the words that end with "ain"
High school cafeteria
Back to basics 25 - Valid variable names
convert matrix to single column
03 - Matrix Variables 1
06 - Matrix Equations 2
07 - Common functions and indexing 3
05 - Vector Equations 2
01 - Scalar variables
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