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
3710
3709
3708
3707
3706
3705
3704
3703
3702
3701
3700
3699
3698
3697
3696
3695
3694
3693
3692
3691
3690