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<?php
	$categories = get_categories( array(
	    'orderby' => 'name',
	    'parent'  => 0
	) );

	$category_list = array();
	foreach ( $categories as $category ) {
		$category_list[] = '<a href="' . get_category_link( $category->term_id ) . '">' . esc_html( $category->name ) . '</a> ';
	}

	echo implode( ', ', $category_list );
?>