Y \ X
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
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
6690
6689
6688
6687
6686
6685
6684
6683
6682
6681
6680
6679
6678
6677
6676
6675
6674
6673
6672
6671
6670