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
7880
7879
7878
7877
7876
7875
7874
7873
7872
7871
7870
7869
7868
7867
7866
7865
7864
7863
7862
7861
7860