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
12160
12159
12158
12157
12156
12155
12154
12153
12152
12151
12150
12149
12148
12147
12146
12145
12144
12143
12142
12141
12140