Y \ X
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
15650
15649
15648
15647
15646
15645
15644
15643
15642
15641
15640
15639
15638
15637
15636
15635
15634
15633
15632
15631
15630