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
13550
13549
13548
13547
13546
13545
13544
13543
13542
13541
13540
13539
13538
13537
13536
13535
13534
13533
13532
13531
13530