Create a variable m as a magic square with the size 6 x 6
Magic squares are defined as square matrices, where the sum of all rows and columns are equal.
(Hint: see help magic)
Replace all the numbers above or equal to 20 with zero.
Return the first and last character of a string
Swap two numbers
Connect blocks in a model
03 - Matrix Variables 1
02 - Vector Variables 3
02 - Vector Variables 2
05 - Vector Equations 2
03 - Matrix Variables 4
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