Image Item No. Description  9540-1 (Inv)  Early Math Numbers Set 108 Parts, 4 Minifigures, 2 Gear, 2004 Catalog: Sets: Educational & Dacta: Explore: Explore Logic: DUPLO: Learning  9547-1 (Inv)  Letters Set 146 Parts, 2004 Catalog: Sets: Educational & Dacta: Explore: Explore Logic: DUPLO: Learning