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
2260
2259
2258
2257
2256
2255
2254
2253
2252
2251
2250
2249
2248
2247
2246
2245
2244
2243
2242
2241
2240