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
4070
4069
4068
4067
4066
4065
4064
4063
4062
4061
4060
4059
4058
4057
4056
4055
4054
4053
4052
4051
4050