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
13850
13849
13848
13847
13846
13845
13844
13843
13842
13841
13840
13839
13838
13837
13836
13835
13834
13833
13832
13831
13830