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
6620
6619
6618
6617
6616
6615
6614
6613
6612
6611
6610
6609
6608
6607
6606
6605
6604
6603
6602
6601
6600