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
9840
9839
9838
9837
9836
9835
9834
9833
9832
9831
9830
9829
9828
9827
9826
9825
9824
9823
9822
9821
9820