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:2018-05-31, Stock:RIO, The news for the past five days is as follows:
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.
2018-05-29: NEWS1: Why These Copper Miners Lowered Their Production Guidance.NEWS2: What Led to the Rise in Glencore’s First-Quarter Copper Production.NEWS3: Is Freeport-McMoRan Inc. (FCX) a Buy?.NEWS4: Is Freeport-McMoRan Inc. (FCX) a Buy?.NEWS5: Barrick Gold Corporation (ABX) Ex-Dividend Date Scheduled for May 30, 2018.NEWS6: Barrick Gold Corporation (ABX) Ex-Dividend Date Scheduled for May 30, 2018.
2018-05-30: NEWS1: Agnico Eagle Mines Limited (AEM) Ex-Dividend Date Scheduled for May 31, 2018.NEWS2: Agnico Eagle Mines Limited (AEM) Ex-Dividend Date Scheduled for May 31, 2018.

Answer: Decrease