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  1. or download this
    require Exporter;
@ISA = qw(Exporter);
...
sub fun2{print "\nfun2 in package " . __PACKAGE__ }
sub fun3{print "\nfun3 in package " . __PACKAGE__ }
sub fun4{print "\nfun4 in package " . __PACKAGE__ }
  2. or download this
    use Module;
fun1;
fun2;
fun3;
fun4;
  3. or download this
    fun1 in package main
fun2 in package main
fun3 in package main
fun4 in package main
  4. or download this
    package Module;
require Exporter;
@ISA = qw(Exporter);
...
  5. or download this
    fun1 in package Module
fun2 in package Module