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 19 - character types
Matrix indexing with two vectors of indices
Compare two input matrices
Basic Monte Carlo Simulation
Check if the input is a strong prime
Bridge and Torch Problem - Length of Unique Time List
unique with nan
Check if the input is an interprime
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