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
11890
11889
11888
11887
11886
11885
11884
11883
11882
11881
11880
11879
11878
11877
11876
11875
11874
11873
11872
11871
11870