#!/usr/bin/perl -l
use warnings;
use strict; 
use Algorithm::Permute;
###########################################################
# Opening file to write the program's output.
################################################### 
open(FH, ">myPer .txt") or die "Cannot open myPer .txt";
########################################################### 
my @arr = qw/A B C/; 
my $N=scalar(@arr); 
my $permu=2; 
my $p = new Algorithm::Permute([@arr], $permu);
print"\n WELCOME to Permutation Analysis:\n
 All Possible Permutations of $permu Elements out of $N .i.e. $N P $permu:\n";
print FH "\n WELCOME to Permutation Analysis:\n
 All Possible Permutations of $permu Elements out of $N .i.e. $N P $permu:\n";
 while (my(@res) = $p->next) {
    do {print join("", @res);};}
 while (my(@res) = $p->next) {
    do {print join("", @res);};} 
close FH; 
exit 0;

##</code><code>##

WELCOME to Permutation Analysis:

 All Possible Permutations of 2 Elements out of 3 .i.e. 3 P2: