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
15040
15039
15038
15037
15036
15035
15034
15033
15032
15031
15030
15029
15028
15027
15026
15025
15024
15023
15022
15021
15020