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
3300
3299
3298
3297
3296
3295
3294
3293
3292
3291
3290
3289
3288
3287
3286
3285
3284
3283
3282
3281
3280