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
Back to basics 25 - Valid variable names
Find a Pythagorean triple
Write out numbers in words
Simple return on investment
Cryptography with A Square Matrix : Decoding
Bridge and Torch Problem - Minimum time
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