Create a hash such as %categories. Iterate over the lines of your list. For each line, split on whitespace, then push @{$categories{$second_column}}, $third_column;
I'm assuming you know how to open a file and read from it. A while loop will be helpful in iterating over each line. Don't forget to chomp.
Output should just be a matter of obtaining the lists held under each hash key and printing them side by side. Another loop with some logic to print a placeholder instead of an item for a given column when one column runs out of entries while others still have entries.
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