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
3110
3109
3108
3107
3106
3105
3104
3103
3102
3101
3100
3099
3098
3097
3096
3095
3094
3093
3092
3091
3090