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
2580
2579
2578
2577
2576
2575
2574
2573
2572
2571
2570
2569
2568
2567
2566
2565
2564
2563
2562
2561
2560