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
12870
12869
12868
12867
12866
12865
12864
12863
12862
12861
12860
12859
12858
12857
12856
12855
12854
12853
12852
12851
12850