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

package DNAlibrary;   #FILE name should be DNAlibrary.pm
use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $VERSION);
use Exporter;
our $VERSION=1.0;
our @ISA = qw(Exporter);
our @EXPORT = qw(DNAappend);#these are the default exports
our @EXPORT_OK = qw();      #these are export on request

sub DNAappend {
  my ($head,$tail)=@_;
  return ($head.$tail)
  }
1;