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
12860
12859
12858
12857
12856
12855
12854
12853
12852
12851
12850
12849
12848
12847
12846
12845
12844
12843
12842
12841
12840