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
8930
8929
8928
8927
8926
8925
8924
8923
8922
8921
8920
8919
8918
8917
8916
8915
8914
8913
8912
8911
8910