Code Duplication    Length = 3-3 lines in 3 locations

includes/abstracts/abstract-wc-shipping-method.php 3 locations

@@ 309-311 (lines=3) @@
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			switch ( $this->availability ) {
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				case 'specific' :
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				case 'including' :
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					$available = in_array( $package['destination']['country'], array_intersect( $countries, array_keys( WC()->countries->get_shipping_countries() ) ) );
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				break;
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				case 'excluding' :
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					$available = in_array( $package['destination']['country'], array_diff( array_keys( WC()->countries->get_shipping_countries() ), $countries ) );
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				break;
@@ 312-314 (lines=3) @@
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				case 'including' :
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					$available = in_array( $package['destination']['country'], array_intersect( $countries, array_keys( WC()->countries->get_shipping_countries() ) ) );
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				break;
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				case 'excluding' :
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					$available = in_array( $package['destination']['country'], array_diff( array_keys( WC()->countries->get_shipping_countries() ), $countries ) );
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				break;
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				default :
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					$available = in_array( $package['destination']['country'], array_keys( WC()->countries->get_shipping_countries() ) );
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				break;
@@ 315-317 (lines=3) @@
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				case 'excluding' :
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					$available = in_array( $package['destination']['country'], array_diff( array_keys( WC()->countries->get_shipping_countries() ), $countries ) );
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				break;
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				default :
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					$available = in_array( $package['destination']['country'], array_keys( WC()->countries->get_shipping_countries() ) );
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				break;
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			}
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		}
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