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:UNH, The news for the past five days is as follows:
2021-12-13: NEWS1: ON BlackRock Advantage Large Cap Value Portfolio Buys Procter & Gamble Co, Life Storage ....NEWS2: UnitedHealth Group (UNH) Stock Moves -0.02%: What You Should Know.NEWS3: UnitedHealth Group Donates $300,000 to YouthZone to Support Teen Mental Health Across Colorado’s Western Slope in Collaboration With the Colorado Attorney General’s Office.NEWS4: The Zacks Analyst Blog Highlights: UNH, PG, CVS, SQ, and ABB.NEWS5: Why Retaining Cigna (CI) Stock for Now is a Prudent Move?.NEWS6: UnitedHealthcare Community Plan of California to Address Health Equity and Expand Access to Health Care With Investments in 17 San Diego-Based Organizations.NEWS7: Centene (CNC) Up 4.8% on Upbeat '22 Guidance: Key Details.NEWS8: New Report Paints a Complex Picture of Americans' Health.NEWS9: 3 Reasons CVS Health Is a Top Dividend Stock to Buy Now.
2021-12-14: NEWS1: United Health Foundation Donates $500,000 to Support Kentucky Communities Devastated by Recent Tornadoes.NEWS2: Strategy Asset Managers Llc Buys Broadcom Inc, eBay Inc, Extra Space Storage Inc, Sells , Meta ....NEWS3: Change Healthcare Holdings LLC -- Moody's announces completion of a periodic review of ratings of Change Healthcare Holdings LLC.NEWS4: 2 Healthcare Stocks You Can Buy and Hold for the Next Decade.
2021-12-15: NEWS1: Dow Jones, Nasdaq Reverse Higher After Surprise Fed Decision; Defensive Sectors Outperform.NEWS2: AI Survey: Health Care Organizations Continue to Adopt Artificial Intelligence to Help Achieve Better, More Equitable and Affordable Patient Outcomes.
2021-12-16: nan
2021-12-17: NEWS1: Jefferies Group LLC Buys Fortress Transportation and Infrastructure Investo, Cedar Fair LP, ....NEWS2: PFM Multi-Manager Series Trust Buys Danaher Corp, Monolithic Power Systems Inc, Clorox Co, ....NEWS3: Teladoc (TDOC) Ties Up to Offer Virtual Care for NLA Members.

Answer: Decrease