[WooCommerce 3.0] Add Northern Ireland to shipping zones

wc-add-nire.php

// https://gist.github.com/WillBrubaker/b9b2415e32a19833aa9c8b1845f64489
add_filter( 'woocommerce_countries',  'handsome_bearded_guy_add_my_country' );
function handsome_bearded_guy_add_my_country( $countries ) {
  $new_countries = array(
	                    'NIRE'  => __( 'Northern Ireland', 'woocommerce' ),
	                    );

	return array_merge( $countries, $new_countries );
}

// https://gist.github.com/WillBrubaker/8194416832c358e44168897f942dd0ef
add_filter( 'woocommerce_continents', 'handsome_bearded_guy_add_my_country_to_continents' );
function handsome_bearded_guy_add_my_country_to_continents( $continents ) {
	$continents['EU']['countries'][] = 'NIRE';
	return $continents;
}

// Kudos to https://gist.github.com/WillBrubaker for the original snippets
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Can we add more than one countriess through this ??? If yes can help me with that ??