dual-tapered is part of:
    50%  tapered

dual-tapered contains:

Full expansion for dual-tapered:
   100%  3x4 Tri-Slope Brick w/ 1x2 Top
   100%  4x4 Angular Cockpit Bottom
   100%  4x4 Dual-Tapered Dual-Notched Brick
   100%  4x4 Dual-Tapered Sloped Brick,1x2 Top
   100%  4x4 Dual-Tapered Stingray Sloped Brick
   100%  4x8 Dual-Tapered Tailfin Plate w/ Slit
   100%  4x9 Tapered Wing Plate
    80%  4x6x1 Angular Cockpit Bottom
    70%  4x10x2.3 Aquashark Canopy
    70%  4x10x2.3 Enclosed Canopy
    70%  4x6x1.3 Angular Windshield
    60%  4x11x2.3 Angular Cockpit Bottom