"first six original warships" . "7.0104" . "62.1792" . "first six major ships" . "6.4008" . "original six frigates of the U.S. Navy" . "first six frigates" . "6.096" . . "first six ships" . "first US Navy sail frigates" . "original six heavy frigates" . "frigate-building program" . "six frigates" . "original six frigates of the United States Navy" . . "American frigates" . "six heavy frigates" . . "12.58824" . "''United States'' class" . "13.1064" . "United States class" . . . "six large frigates" . "Original six frigates" . "four ships to carry forty-four guns each, and two ships to carry thirty-six guns each" . "Classic Frigate" . "12.4968" . "Original six frigates of the United States Navy" . "six new frigates" . "Original six frigates of the United States Navy" . "original six" . "six original frigates" . "46.57344" . "an 'Original Six' frigate" . . "six original United States frigates" . . "49.9872" . "older" . "six original U.S. frigates" . . "original six frigates" . "first significant warships" .