optimal [(0, 1, 2, 3), (0, 5, 8, 9), (1, 6, 7, 8), (2, 4, 5, 6), (3, 4, 7, 9)] (if conjecture about Ferrers Diagram Rank-Metric Codes is true: 68719738953 with optimal [(0, 1, 2, 3), (0, 4, 5, 6), (1, 5, 7, 9), (2, 6, 8, 9), (3, 4, 7, 8)])
) : 68719509514