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<?php

function rkv_remove_columns( $columns ) {

	// remove the Yoast SEO columns
	unset( $columns['wpseo-score'] );
	unset( $columns['wpseo-title'] );
	unset( $columns['wpseo-metadesc'] );
	unset( $columns['wpseo-focuskw'] );

	return $columns;

}
add_filter ( 'manage_edit-post_columns', 'rkv_remove_columns' );