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
Prime factor digits
Make a random, non-repeating vector.
Check if number exists in vector
Output any real number that is neither positive nor negative
Moving average (variable kernel length)
Lunar Arithmetic (Multiplication)
String permutations on phone keyboard
Lunar Arithmetic (Addition)
Repeat string n times - 2
Repeat string n times - 3
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