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
13900
13899
13898
13897
13896
13895
13894
13893
13892
13891
13890
13889
13888
13887
13886
13885
13884
13883
13882
13881
13880