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:2018-05-23, Stock:RIO, The news for the past five days is as follows:
2018-05-16: NEWS1: Insight: How Rusal escaped the noose of U.S. sanctions.NEWS2: How Rusal escaped the noose of U.S. sanctions.NEWS3: Brokerages Take a Fresh Look at First Quantum Minerals in May.NEWS4: How a Russian aluminum giant escaped the noose of U.S. sanctions.NEWS5: How Analysts Rate Antofagasta in 2Q18.NEWS6: Rio Tinto CEO calls for 'United Nations of the mining world'.NEWS7: How Rusal escaped the noose of U.S. sanctions.
2018-05-17: NEWS1: What’s Making Carl Icahn Bearish on Freeport-McMoRan?.
2018-05-18: NEWS1: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for May 21, 2018.NEWS2: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for May 21, 2018.
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.

Answer: Decrease