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
13000
12999
12998
12997
12996
12995
12994
12993
12992
12991
12990
12989
12988
12987
12986
12985
12984
12983
12982
12981
12980