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
5540
5539
5538
5537
5536
5535
5534
5533
5532
5531
5530
5529
5528
5527
5526
5525
5524
5523
5522
5521
5520