Y \ X
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
2730
2729
2728
2727
2726
2725
2724
2723
2722
2721
2720
2719
2718
2717
2716
2715
2714
2713
2712
2711
2710