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
8170
8169
8168
8167
8166
8165
8164
8163
8162
8161
8160
8159
8158
8157
8156
8155
8154
8153
8152
8151
8150