The description of this problem is not very clear. It's really asking for the first and last row for each unique value in the first column.
"However there will be more than one row index and that makes this question challenging." - that really explains nothing to me
middleAsColumn: Return all but first and last element as a column vector
Equal to their cube
03 - Matrix Variables 1
05 - Vector Equations 2
Make visible max values
Lunar Arithmetic (Multiplication)
Challenging perms function!
Find two triangular numbers whose sum is input.
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