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create dataFrame of Sharpe ratio in 2020 and (B) dataFrame of Sharpe ratio in 2021. Then merge (A) dataFrame of Sharpe ratio in 2020 and

create dataFrame of Sharpe ratio in 2020 and (B) dataFrame of Sharpe ratio in 2021. Then merge (A) dataFrame of Sharpe ratio in 2020 and (B) dataFrame of Sharpe ratio in 2020. The merged keys should be month. Also add suffixes ("_2020" and "_2021") to distinguish years,

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