. . . . . . . . "U" . . . . "U (''Umpire'') class" . "See here" . "20.835" . . "British U-class submarine" . . . . . "British U-class submarine" . "U (Undine) class" . . . . . . . . "Umpire class" . . "''Undine'' class" . . "U (''Uproar'') class" . . . . . . . . . . . "U-class" . . "British U class" . . . . "U (Uproar) class" . "''Umpire'' class" . . . . . . . . "U class" . . . . "''U''" . . . . . . . . "U-class submarines" . . . "4.8768" . . . . . . . . "U-class submarine" . "58.2168" . . "British U-class" . . . . . . . . . . . . . "U (''Undine'') class" . .