For each orbit O_i we give a canonical representative vertex v_i : (denominator | coordinates) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The orbits are ordered first by decreasing incidence Icd_i, then by decreasing adjacency Adj_i and then by increasing orbitsize |O_i| ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -------------- canonical representatives -------------------------- i denominator | coordinates 1 1 | 0 0 0 -------------------------------------------------------------------