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We discuss some large effects of dynamical fermions. One is a cutoff effect,others concern the contribution of multi-pion states to correlation functionsand are expected to survive the continuum limit. We then turn to thepreparation for simulations at small lattice spacings which we are planningdown to around a=0.04fm in order to understand the size of O(a^2)-effects ofthe standard O(a)-improved theory. The dependence of the lattice spacing on thebare coupling is determined through the Schr"odinger functional renormalizedcoupling.

Preparing for N_f=2 simulations at small lattice spacings