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
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Back to basics 23 - Triangular matrix
Basics: 'Find the eigenvalues of given matrix
Fahrenheit to Celsius converter
Duration of a trip in minutes
Find a real root of a quintic function
Write out numbers in words
List all of the integer points in a bounded feasble region
Create co-occurrence matrix
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