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This article uses the supersymmetric WKB approximation to obtain the approximate energy levels and wave functions of the anharmonic potential V(r) = ar2 + br-4 + cr-6 in order to tesify the correctness between [Phys.Lett. A 170 (1992) 335] and the paper written by M. Landtman [Phys. Lett. A 175 (1993) 147].