Y \ X
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
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
2880
2879
2878
2877
2876
2875
2874
2873
2872
2871
2870
2869
2868
2867
2866
2865
2864
2863
2862
2861
2860