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
5690
5689
5688
5687
5686
5685
5684
5683
5682
5681
5680
5679
5678
5677
5676
5675
5674
5673
5672
5671
5670