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
Roll the Dice!
Back to basics 19 - character types
System of equations
Number of digits in an integer
'5*3' copy character 3 - five times
Van Eck's Sequence's nth member
Check if the input is a strong prime
Find the biggest digit in a matrix
Challenging perms function!
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