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
9660
9659
9658
9657
9656
9655
9654
9653
9652
9651
9650
9649
9648
9647
9646
9645
9644
9643
9642
9641
9640