The OSPREY protein design software [20] takes as input an initial protein structure, a rotamer library, an energy function to rank conformations, and the allowed flexibility of the protein during the search. OSPREY uses DEE criteria to prune rotamers from the search that are guaranteed to not participate in any low energy conformations. The rotamers remaining after pruning are input to the conformation enumeration step where conformations are enumerated in order of lowest energy, or in the case of continuous rotamers, in order of lowest energy bound.