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
Find the alphabetic word product
Sums with Excluded Digits
Find the palindrome
Is A the inverse of B?
Create co-occurrence matrix
Cryptography with A Square Matrix : Encoding
Grouped Frequency Distributions
Repeat string n times - 2
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