Y \ X
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
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
4580
4579
4578
4577
4576
4575
4574
4573
4572
4571
4570
4569
4568
4567
4566
4565
4564
4563
4562
4561
4560