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
10990
10989
10988
10987
10986
10985
10984
10983
10982
10981
10980
10979
10978
10977
10976
10975
10974
10973
10972
10971
10970