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
Which doors are open?
Back to basics 12 - Input Arguments
Generate a NaN...on purpose
Good Morning :)
Low level NaN
Pi Digit Probability
Area under standard normal curve
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