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We show that for a non-trivial transitive dynamical system,it has a dense Mycielskiinvariant strongly scrambled set if and only if it has a fixed point,andit has a dense Mycielski invariant δ-scrambled set for some δ > 0 if and onlyif it has a fixed point and not uniformly rigid.We also provide two methodsof construction of completely scrambled systems which are weakly mixing,proximal and uniformly rigid.(This is a joint work with Magdalena Fory′s,Wen Huang and Piotr Oprocha.)