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
3560
3559
3558
3557
3556
3555
3554
3553
3552
3551
3550
3549
3548
3547
3546
3545
3544
3543
3542
3541
3540