#!/usr/bin/perl -w
use strict;

use Algorithm::Loops qw( NestedLoops NextPermute );

my @items= qw( prefix first middle last title );
my $choose= 3;
my $iter= NestedLoops(
    [   [ 0..$#items ],
        ( sub { [ $_+1 .. $#items ] } ) x ( $choose - 1 ),
    ],
    # Uncomment next line if you want all sizes <= $choose
    # { OnlyWhen => 1 },
);
my @choice;
while(  @choice= sort @items[$iter->()]  ) {
    do {
        print "@choice\n";
        # replace above line with your code
    } while(  NextPermute(@choice)  );
}