Based on the news about the stock in the past five trading days, please predict the rise or fall of the stock in the next trading day. If the stock is predicted to rise in the next trading day, please output [Rise], if the stock is predicted to fall in the next trading day, please output [Decrease].

Date:2021-12-20, Stock:RIO, The news for the past five days is as follows:
2021-12-13: NEWS1: Why Shares of Turquoise Hill Resources Are Soaring Today.NEWS2: Rio Tinto to Cancel Mongolia’s $2.3 Billion Debt.NEWS3: UPDATE 2-Rio offers to cancel Mongolia debt to advance Oyu Tolgoi copper mine.NEWS4: Rio Tinto Gains  Despite Writing Off Mongolian Loan to Push Copper-Gold Project.
2021-12-14: NEWS1: 13 Uranium Stocks Popular on Reddit.
2021-12-15: NEWS1: New Strong Sell Stocks for December 15th.NEWS2: Is WisdomTree International Hedged Quality Dividend Growth ETF (IHDG) a Strong ETF Right Now?.
2021-12-16: nan
2021-12-17: NEWS1: Fidelity Destiny Portfolios Buys Salesforce. ....

Answer: Decrease