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:2018-05-29, Stock:RIO, The news for the past five days is as follows:
2018-05-21: nan
2018-05-22: NEWS1: Australia's Rio Tinto in talks with Inalum, Freeport for Grasberg stake.NEWS2: Rio Tinto's Arnaud Soirat Sees Copper Under-Supplied by 2021.NEWS3: Rio Tinto Is Ready to Accept $3.5 Billion Deal to Exit Grasberg.NEWS4: Rio Tinto presses Mongolia to shore up copper investment.NEWS5: [$$] Rio Tinto warns Mongolia on tampering with rights to copper mine.
2018-05-23: NEWS1: How Losing Control Of The World's Biggest Gold Mine Could Pay Off For Freeport.NEWS2: BHP Billiton Braves Iron-Ore Price Slump on Robust Yield.NEWS3: BHP Billiton Braves Iron-Ore Price Slump on Robust Yield.NEWS4: Freeport-McMoRan Stock Upgraded: What You Need to Know.NEWS5: Freeport-McMoRan Stock Upgraded: What You Need to Know.NEWS6: Freeport-McMoRan Stock Upgraded: What You Need to Know.NEWS7: Wheaton Precious Metals Corp. (WPM) Ex-Dividend Date Scheduled for May 24, 2018.NEWS8: Wheaton Precious Metals Corp. (WPM) Ex-Dividend Date Scheduled for May 24, 2018.NEWS9: Rio Tinto negotiates Grasberg copper exit.NEWS10: [$$] Rio Tinto in talks over Grasberg exit.NEWS11: Freeport-McMoRan Is Up ~13% in May: Can Hot Streak Continue?.NEWS12: [$$] Rio Tinto confirms talks over $3.5bn Indonesia mine exit.NEWS13: Which Mining Company Is the Best Dividend Stock?.NEWS14: Which Mining Company Is the Best Dividend Stock?.NEWS15: Which Mining Company Is the Best Dividend Stock?.NEWS16: Freeport’s Grasberg Jujitsu Move Will Pay Off in the End.NEWS17: Rio Tinto Ready to Accept Grasberg Deal.NEWS18: Rio Tinto Ready to Accept Grasberg Deal.
2018-05-24: NEWS1: Why Vale’s Iron Ore Margins Should Remain Supported.NEWS2: Alcoa Bears: Ignore the Risks at Your Own Peril.NEWS3: What Could Work in Alcoa’s Favor This Year?.NEWS4: 5 Reasons to Love Alcoa Stock…and 3 Not To.NEWS5: Freeport-McMoRan Faces a $3.5 Billion Question.NEWS6: Distraction or disaster? Freeport’s giant Indonesian mine haunted by audit report.NEWS7: Deadly protests land a blow to Indian resources magnate Agarwal's ambitions.
2018-05-25: NEWS1: Why Analyst Sentiment for Vale Has Been Negative Lately.NEWS2: Vale’s Net Debt Position Improves, Excess Cash Going to Dividends.NEWS3: Distraction or disaster? Freeport’s giant Indonesian mine haunted by audit report.

Answer: Decrease