Y \ X
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
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
3610
3609
3608
3607
3606
3605
3604
3603
3602
3601
3600
3599
3598
3597
3596
3595
3594
3593
3592
3591
3590