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
3200
3199
3198
3197
3196
3195
3194
3193
3192
3191
3190
3189
3188
3187
3186
3185
3184
3183
3182
3181
3180