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
3280
3279
3278
3277
3276
3275
3274
3273
3272
3271
3270
3269
3268
3267
3266
3265
3264
3263
3262
3261
3260