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We find that the model generates a dynamical dark energy that can account for the presently observed value of $\\Omega_{\\rm DE}$, without introducing a cosmological constant. Tuning a free mass parameter $m$ to a value $m\\simeq 0.67 H_0$ we reproduce the observed value $\\Omega_{\\rm DE}\\simeq 0.68$. This leaves us with no free parameter and we then get a pure prediction for the EOS parameter of dark energy. 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