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
8100
8099
8098
8097
8096
8095
8094
8093
8092
8091
8090
8089
8088
8087
8086
8085
8084
8083
8082
8081
8080