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wp-content/plugins/wordpress-seo/admin/interface-collection.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin
+ */
+
+/**
+ * Interface that represents a collection.
+ */
+interface WPSEO_Collection {
+
+	/**
+	 * Returns the collection data.
+	 *
+	 * @return array The collection data.
+	 */
+	public function get();
+}