Y \ X
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
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
9600
9599
9598
9597
9596
9595
9594
9593
9592
9591
9590
9589
9588
9587
9586
9585
9584
9583
9582
9581
9580