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
3260
3259
3258
3257
3256
3255
3254
3253
3252
3251
3250
3249
3248
3247
3246
3245
3244
3243
3242
3241
3240