Keywords: Tamari lattice, 2-subsets.svg The associahedron of order 4 or K<sub>5</sub> the Hasse diagram of the Tamari lattice of order 4 Like File Tamari lattice ovals svg but with 2-subsets m n instead of ovals or paretheses around the objects m n Own mate2code Associahedron K5 Tamari lattice T4 Hasse diagrams Triangular n choose 2 arrays with binary entries |