tapered is part of:

tapered contains:
    50%  dual-tapered
    50%  trapezoidal

Full expansion for tapered:
    90%  3x4 Tri-Slope Brick w/ 1x2 Top
    90%  4x4 Angular Cockpit Bottom
    90%  4x4 Dual-Tapered Dual-Notched Brick
    90%  4x4 Dual-Tapered Sloped Brick,1x2 Top
    90%  4x4 Dual-Tapered Stingray Sloped Brick
    90%  4x4 Notched Trapezoidal Nose Brick
    80%  12x9x2.3 Tapered-Down Panel w/ Vents
    80%  4x6 Notched Multi-Tapered Nose Brick
    80%  4x8x3.3 Tapered-Down Panel
    80%  4x8x3.3 Tapered-Down Panel w/ UFO Deco
    80%  4x8x3.3 Tapered-Up Panel
    80%  4x8x3.3 Tapered-Up Panel w/ UFO Deco
    70%  4x6x1 Angular Cockpit Bottom
    60%  4x10x2.3 Aquashark Canopy
    60%  4x10x2.3 Enclosed Canopy
    60%  4x6x1.3 Angular Windshield
    50%  4x11x2.3 Angular Cockpit Bottom
    50%  4x8 Dual-Tapered Tailfin Plate w/ Slit
    50%  4x9 Tapered Wing Plate
    48%  1x6x3 Trapezoidal Basin End-Cap
    45%  3x4 Notched Trapezoidal Plate
    45%  6x7 Trapezoidal Boat Plate
    40%  3x6x3 Trapezoidal Basin Dumping-End
    40%  6x7 Notched Trapezoidal Boat Brick
    40%  6x7 Notched Trapezoidal Boat Deck
    40%  6x8 Thick Trapezoidal Lattice Plate
    35%  8x8 Notched Trapezoidal Plate