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In this short note, we give a very efficient proof of a recent result ofTreil-Volberg and Lacey--Spencer giving sufficient conditions for thetwo-weight boundedness of a sparse operator. We also give a new sufficientcondition for the two-weight boundedness of a sparse operator. We make criticaluse of a formula of Hyt\"onen

Entropy Bumps and Another Sufficient Condition for the Two--Weight Boundedness of Sparse Operators