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
4240
4239
4238
4237
4236
4235
4234
4233
4232
4231
4230
4229
4228
4227
4226
4225
4224
4223
4222
4221
4220