Y \ X
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
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
3930
3929
3928
3927
3926
3925
3924
3923
3922
3921
3920
3919
3918
3917
3916
3915
3914
3913
3912
3911
3910