De=Db=DcD_e = D_b = D_cDe=Db=Dc
De<Db=DcD_e < D_b = D_cDe<Db=Dc
De>Db>DcD_e > D_b > DcDe>Db>Dc
De>Dc>DbD_e>D_c > D_bDe>Dc>Db