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
15320
15319
15318
15317
15316
15315
15314
15313
15312
15311
15310
15309
15308
15307
15306
15305
15304
15303
15302
15301
15300