Y \ X
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
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
9860
9859
9858
9857
9856
9855
9854
9853
9852
9851
9850
9849
9848
9847
9846
9845
9844
9843
9842
9841
9840