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
12470
12469
12468
12467
12466
12465
12464
12463
12462
12461
12460
12459
12458
12457
12456
12455
12454
12453
12452
12451
12450