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
Make one big string out of two smaller strings
Generate pi using logarithm
Sum the 'edge' values of a matrix
Find two triangular numbers whose sum is input.
Calculate trends in time series
'5*3' copy character 3 - five times
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