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We study RI/MOM renormalization constants of bilinear quark operators for$N_f=4$ and the strong coupling constant for $N_f=2+1+1$ using Wilsontwisted-mass fermions. We use the "egalitarian" method to remove H(4)hypercubic artifacts non-perturbatively, which enables us to study physicalquantities in a wide range of momenta. We then apply OPE in studying therunning behavior of $Z_q$ and $\alpha_s$, from which we are able to extract theLandau gauge dimension-two gluon condensate $<A^2>$ which is ofphenomenological interest.

RI/MOM renormalization constants (N_f=4) and the strong coupling constant (N_f=2+1+1) from twisted-mass QCD