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
4740
4739
4738
4737
4736
4735
4734
4733
4732
4731
4730
4729
4728
4727
4726
4725
4724
4723
4722
4721
4720