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:2018-12-20, Stock:UNH, The news for the past five days is as follows:
2018-12-13: NEWS1: UnitedHealthcare Insurance Company -- Moody's rates UnitedHealth Group's senior notes A3; outlook stable.NEWS2: Owens & Minor, Inc. (OMI) Ex-Dividend Date Scheduled for December 14, 2018.NEWS3: Owens & Minor, Inc. (OMI) Ex-Dividend Date Scheduled for December 14, 2018.NEWS4: UnitedHealth Group (UNH) Outpaces Stock Market Gains: What You Should Know.NEWS5: UnitedHealth Group (UNH) Outpaces Stock Market Gains: What You Should Know.
2018-12-14: NEWS1: UnitedHealth Falls 3%.
2018-12-17: NEWS1: UnitedHealth Falls 3%.NEWS2: US STOCKS-S&P 500 hits 14-month low on economic jitters ahead of Fed meeting.NEWS3: US STOCKS-S&P 500 hits 14-month low on economic jitters ahead of Fed meeting.NEWS4: Will Lower Revenues Hurt BlackBerry's (BB) Q3 Earnings?.NEWS5: UnitedHealth trims purchase price for DaVita&apos;s medical group by $560M.NEWS6: Health Care Stocks Sink Midday After Obamacare Ruling.NEWS7: Healthcare Battered By Texas ACA Ruling.NEWS8: Healthcare Battered By Texas ACA Ruling.NEWS9: 5 Healthcare Stocks That Are Feeling Sick.NEWS10: Why the Earnings Surprise Streak Could Continue for UnitedHealth (UNH).NEWS11: Why the Earnings Surprise Streak Could Continue for UnitedHealth (UNH).NEWS12: Healthcare Stocks Take a Hit on Texas ACA Ruling.NEWS13: Healthcare Stocks Take a Hit on Texas ACA Ruling.NEWS14: Stock Market Trims Losses; Nasdaq, Small Caps Lead.NEWS15: Stocks Turn Mixed As Nasdaq Rises; Miners Rally.NEWS16: Healthcare Battered By Texas ACA Ruling.NEWS17: Healthcare Stocks Take a Hit on Texas ACA Ruling.NEWS18: Why the Earnings Surprise Streak Could Continue for UnitedHealth (UNH).NEWS19: Should You Invest in the Invesco DWA Healthcare Momentum ETF (PTH)?.
2018-12-18: NEWS1: UnitedHealth Group (UNH) Stock Sinks As Market Gains: What You Should Know.NEWS2: UnitedHealth Group Breaks Below 200-Day Moving Average - Notable for UNH.NEWS3: UnitedHealth Group Breaks Below 200-Day Moving Average - Notable for UNH.NEWS4: AM Best Affirms Credit Ratings of UnitedHealth Group Incorporated and Its UnitedHealthcare Subsidiaries.NEWS5: Healthcare ETFs Sink on JNJ News, ACA Ruling: What???s Ahead?.NEWS6: Catalyst Health Network and UnitedHealthcare’s Accountable Care Organization Relationship Fostering Quality Care at Lower Cost.NEWS7: Will Lower Revenues Hurt BlackBerry's (BB) Q3 Earnings?.NEWS8: Will Lower Revenues Hurt BlackBerry's (BB) Q3 Earnings?.
2018-12-19: NEWS1: 7 Safe Haven Stocks for a Treacherous Market.NEWS2: 7 Safe Haven Stocks for a Treacherous Market.NEWS3: Best ETFs for 2019: iShares U.S. Healthcare Providers ETF Can Run Higher.NEWS4: Best ETFs for 2019: iShares U.S. Healthcare Providers ETF Can Run Higher.NEWS5: Best ETFs for 2019: iShares U.S. Healthcare Providers ETF Can Run Higher.NEWS6: Is UnitedHealth Group Incorporated’s (NYSE:UNH) ROE Of 24% Impressive?.NEWS7: UnitedHealth Group (UNH) Stock Sinks As Market Gains: What You Should Know.NEWS8: UnitedHealth Group (UNH) Stock Sinks As Market Gains: What You Should Know.

Answer: Decrease