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
10860
10859
10858
10857
10856
10855
10854
10853
10852
10851
10850
10849
10848
10847
10846
10845
10844
10843
10842
10841
10840