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
5870
5869
5868
5867
5866
5865
5864
5863
5862
5861
5860
5859
5858
5857
5856
5855
5854
5853
5852
5851
5850