Other vessels may have twin, triple or quadruple screws. The population of Akutan can quadruple or quintuple during processing months. "Dubbel/Double," "Tripel/Triple and Quadrupel/Quadruple". This gives the illusion of a true triple or quadruple stop. Terms such as "quadruple" (4), "quintuple" (5), and so on, are also occasionally used. Robinson recorded the last quadruple double in NBA history with the Spurs. The series featured controversy about Tim Duncan getting a quadruple double in game 6. This 256-bit octuple precision is for applications requiring results in higher than quadruple precision. Eight torpedo tubes were to be carried in two quadruple mounts. A major improvement was the addition of power operation to both twin and quadruple mounts. Her armament was rounded out by eight torpedo tubes mounted in two quadruple launchers. Armament was to be increased with six additional 40mm quadruple mounts. Two sets of quadruple 21-inch torpedo tubes were fitted. These lines range from single to quadruple track or more. Every Pythagorean quadruple is an integer multiple of a primitive quadruple.