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
2970
2969
2968
2967
2966
2965
2964
2963
2962
2961
2960
2959
2958
2957
2956
2955
2954
2953
2952
2951
2950