Y \ X
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
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
13920
13919
13918
13917
13916
13915
13914
13913
13912
13911
13910
13909
13908
13907
13906
13905
13904
13903
13902
13901
13900