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Yachiyo_R's editorials

# Problem
865 OMCB040(G)
866 OMCB040(C)
906 OMCB043(E)
918 OMCB044(C)
921 OMCB045(C)
928 OMCE015(D)
973 OMCB048(A)
974 OMCB048(B)