Y \ X
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
13840
13839
13838
13837
13836
13835
13834
13833
13832
13831
13830
13829
13828
13827
13826
13825
13824
13823
13822
13821
13820