"CB-class midget submarine" . . "3.0" . "midget submarines" . . . "CB" . "''CB-5''" . "Italian midget submarines" . . "midget-submarines" . . "''CB'' class" . . "15.0" . "CB-4" . . . "''CB''-class" . "CB-20" . . . "13.89" . "CB-6" . "CB class" . "CB-class" . . . . . "CB-3" . . . "CB-1" . . . . . "CB-class midget submarine" . "CB-2" . . . .