Y \ X
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
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
12900
12899
12898
12897
12896
12895
12894
12893
12892
12891
12890
12889
12888
12887
12886
12885
12884
12883
12882
12881
12880