round-top is part of:

round-top contains:

Full expansion for round-top:
   100%  2x2x1.8 DUPLO Round-Top Brick
   100%  2x4x1.3 Round-Top Brick
   100%  3x3x6 Curved-Top Corner Thin-Wall
   100%  3x4x6 Curved-Top Side Thin-Wall
    90%  2x2x1.3 Round-Top Brick w/ Top Studs
    80%  2x2x1.6 Bell-Jar
    50%  1x1x1.3 Half-Round-Top Brick w/Plate
    50%  1x2x2 Car Radiator w/ Side Lights
    50%  1x4x1.3 Half-Round-Top Brick
    50%  1x4x1.3 Half-Round-Top Brick w/Plate