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
13710
13709
13708
13707
13706
13705
13704
13703
13702
13701
13700
13699
13698
13697
13696
13695
13694
13693
13692
13691
13690