bottom is part of:

bottom contains:

Full expansion for bottom:
   100%  10x10x4 Octagonal Dome Bottom
   100%  2x4x2 DUPLO Brick w/ Cat Bottom
   100%  2x4x2 DUPLO Brick w/ Dog Bottom
    95%  2x2 Disc w/ Convex Round Bottom
    90%  2x4x6 Sarcophagus Bottom
    80%  10x10x2.3 Quarter-Dome Bottom
    80%  6x8x3 Oct. Dome Half-Bottom
    20%  3x4x2.6 Stackable Crate
    10%  Firefighter Hose-Helmet Bottom
    10%  4x4 Dome-Backing Disc w/ 1x2 Plate