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  1. or download this
    my %versions = ( 1 => 'interface1', 2 => 'interface2' );
my $interface = $versions{$version};
$interface->some_func();
  2. or download this
    my %versions = ( 1 => 'interface1', 2 => 'interface2' );
my $interface = $versions{$version};
$interface->import();
some_func();