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:2019-02-21, Stock:UNH, The news for the past five days is as follows:
2019-02-13: NEWS1: UnitedHealth Stock Is a Buy, but Keep an Eye on the External Risks.NEWS2: UnitedHealth Stock Is a Buy, but Keep an Eye on the External Risks.NEWS3: UnitedHealth Group Continues To Lead Medicare Market.NEWS4: UnitedHealth Group Continues To Lead Medicare Market.NEWS5: UnitedHealth Stock Is a Buy, but Keep an Eye on the External Risks.NEWS6: Ex-Mayo Clinic CEO Dr. John Noseworthy joining UnitedHealth's board of directors.NEWS7: John H. Noseworthy, M.D., Joins UnitedHealth Group Board of Directors.
2019-02-14: NEWS1: These are the most beloved stocks in the Dow.NEWS2: Why Is UnitedHealth (UNH) Up 0.9% Since Last Earnings Report?.NEWS3: Why Is UnitedHealth (UNH) Up 0.9% Since Last Earnings Report?.NEWS4: Underperforming Alternative Investments Weighed Heavily On AIG In 2018.NEWS5: Underperforming Alternative Investments Weighed Heavily On AIG In 2018.NEWS6: Here's Why Investing in Molina Healthcare (MOH) Makes Sense.NEWS7: Here's Why Investing in Molina Healthcare (MOH) Makes Sense.NEWS8: Why Is UnitedHealth (UNH) Up 0.9% Since Last Earnings Report?.NEWS9: UnitedHealthcare Vision Plans Again Rank Highest in Customer Satisfaction in J.D. Power Report.NEWS10: Here's Why Investing in Molina Healthcare (MOH) Makes Sense.
2019-02-15: nan
2019-02-19: NEWS1: Here's Why You Should Add Centene (CNC) to Your Portfolio.NEWS2: Here's Why You Should Add Centene (CNC) to Your Portfolio.NEWS3: IWB, UNH, V, PFE: ETF Outflow Alert.NEWS4: IWB, UNH, V, PFE: ETF Outflow Alert.NEWS5: Here's Why You Should Add Centene (CNC) to Your Portfolio.
2019-02-20: NEWS1: UnitedHealth Group (UNH) Stock Sinks As Market Gains: What You Should Know.NEWS2: Only five T. Rowe Price U.S. mutual funds saw positive returns in 2018.NEWS3: Trump Administration Is No Friend to Pharmacy Benefit Managers Like CVS.NEWS4: Has UnitedHealth Group (UNH) Outpaced Other Medical Stocks This Year?.NEWS5: Has UnitedHealth Group (UNH) Outpaced Other Medical Stocks This Year?.NEWS6: Pick These 5 Stocks With Superb Interest Coverage Ratio.NEWS7: Pick These 5 Stocks With Superb Interest Coverage Ratio.NEWS8: Has UnitedHealth Group (UNH) Outpaced Other Medical Stocks This Year?.NEWS9: UnitedHealthcare Helps People Manage Chronic Conditions Through Data-Powered Nerve Center as Navigate4Me Program Expands.NEWS10: Pick These 5 Stocks With Superb Interest Coverage Ratio.NEWS11: What Do Analysts Think About UnitedHealth Group Incorporated’s (NYSE:UNH) Future?.NEWS12: Metro East surgical centers to be sold after closing last fall.NEWS13: Tivity Health, Inc. (TVTY) Q4 2018 Earnings Conference Call Transcript.

Answer: Decrease