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
2750
2749
2748
2747
2746
2745
2744
2743
2742
2741
2740
2739
2738
2737
2736
2735
2734
2733
2732
2731
2730