Find some estimator Zn in terms of X1, X2, …, Xn such that Zn converges in probability to sigma^2

Let i.i.d. Xn~N(0, sigma^2) for n>=1 and sigma^2 unknown. Find
some estimator Zn in terms of X1, X2, …, Xn such that Zn converges in probability to sigma^2
 
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