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
Summing Digits within Text
Angle of triangle
Generate a string like abbcccddddeeeee
Generate pi using logarithm
Swap two numbers
Go back n times
Bridge and Torch Problem - Length of Unique Time List
Repeat string n times
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