. . . . "Type 23s" . . . "Type 23 frigates" . . . . . "Type 23 or ''Duke''-class frigate" . "''Duke''-class" . . . . . . . . "Duke-class frigate" . "type 23 frigate" . "frigate" . . . "133.0" . . "51.856" . "16.1" . "Duke class" . "Type 23 Duke" . . . . . . . "4.9E9" . . "Type 23 (Duke class)" . . . . . . . "Type 23 frigate" . . . . "Type 23 anti-submarine frigates" . . . "Type 23 class" . . . "Type 23 Duke class" . . . . . . . . . "Type 23 or ''Duke''" . "Type 23 frigate" . "Type 23" . . .