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
2830
2829
2828
2827
2826
2825
2824
2823
2822
2821
2820
2819
2818
2817
2816
2815
2814
2813
2812
2811
2810