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

use Algorithm::Loops qw( NestedLoops );

my @items= ( 1..6 );
my $choose= 3;
my $iter= NestedLoops(
    [   [ 0..$#items ],
        ( sub { [ $_+1 .. $#items ] } ) x ($choose-1),
    ],
);
my @choice;
while(  @choice= @items[$iter->()]  ) {
    print "@choice\n";
    # replace above line with your code
}