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
9770
9769
9768
9767
9766
9765
9764
9763
9762
9761
9760
9759
9758
9757
9756
9755
9754
9753
9752
9751
9750