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
12710
12709
12708
12707
12706
12705
12704
12703
12702
12701
12700
12699
12698
12697
12696
12695
12694
12693
12692
12691
12690