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
10470
10469
10468
10467
10466
10465
10464
10463
10462
10461
10460
10459
10458
10457
10456
10455
10454
10453
10452
10451
10450