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A continuum of language alternation phenomena is discussed which spans out between the prototypes labelled codeswitching (CS),language mixing(LM),and fused lects (FLs), with CS and FLs representing the polar extremes of the continuum and LM a point in between. In addition, an interpretation of this continuum is suggested according to which the transition CS-LM-FL can be understood as a case of structural sedimentation.
Peter Auer (1999) studied this question.