We investigate a new light fermion action (the ``D234 action), which is accurate up to $O(a^3)$ and tadpole-improved $O(a alpha_s)$ errors. Using D234 with Symanzik- and tadpole-improved glue we find evidence that continuum results for the quenched hadron spectrum (pion, rho and nucleon) can be obtained on coarse lattices.
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