Test model with a final mass of 8904 M_⊙ computed using a constant accretion rate of 3.5 M_⊙ yr⁻¹ until the end of core helium burning. Left panel: the Kippenhahn diagram showing the evolution of radius versus time. The blue and cream regions represents the convective and radiative zones respectively. Core hydrogen burning is shown in dotted zone and core helium burning in brown zone. The black lines represents the iso-masses and the white lines depict the iso-thermal lines. Right panel: the abundance profile inside the 8904 M_⊙ model at the end of core helium burning. The label for each element matches the corresponding line.