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
15630
15629
15628
15627
15626
15625
15624
15623
15622
15621
15620
15619
15618
15617
15616
15615
15614
15613
15612
15611
15610