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
4880
4879
4878
4877
4876
4875
4874
4873
4872
4871
4870
4869
4868
4867
4866
4865
4864
4863
4862
4861
4860