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I would claim that the way we do research in a more phenomenological , ethnographically oriented tradition is no less scientific . Also in the early years there were frequently differences of opinion between federal , state , and local officials as to how these programs should be handled . in setting the discretionary portion of the exclusion renders the 10-year length of the exclusion unreasonable , and , if so , to set an exclusion of a reasonable length . Contemporary theoretical advances show that power laws describe self-similarity , or scale invariance , with respect to geometrical , statistical and dynamic properties of complex nonlinear systems .