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Diachronic changes in the order of affixes occur commonly in one situation: when inflectional affixes are trapped in an internal position as the result of the grammaticalization and affixation of an uninflected element, they are commonly externalized. A number of instances of this type of change are discussed, and some constraints obeyed by such changes are formulated.
Martín Haspelmath (Fri,) studied this question.