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
12040
12039
12038
12037
12036
12035
12034
12033
12032
12031
12030
12029
12028
12027
12026
12025
12024
12023
12022
12021
12020