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
10860
10859
10858
10857
10856
10855
10854
10853
10852
10851
10850
10849
10848
10847
10846
10845
10844
10843
10842
10841
10840