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  1. or download this
    #!/usr/bin/perl

...
$hash_to_send{third_colour} = "blue";

return &Y::module_subroutine($hash_to_send);
  2. or download this
    #!/usr/bin/perl
package Y;
...
my($hash) = @_;
return "The colour of the sky is ".$hash{third_colour};
}
  3. or download this
    return &Y::module_subroutine(\$hash_to_send);