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:2020-12-31, Stock:PTR, The news for the past five days is as follows:
2020-12-23: NEWS1: PetroChina (PTR) Hits Gas Prospect in China's Xinjiang Province.NEWS2: China Pipeline Giant to Buy Kunlun Assets for $6.3 Billion.
2020-12-24: NEWS1: Kunlun Energy Company Limited -- Moody's affirms Kunlun Energy's A2 ratings; outlook stable.
2020-12-28: nan
2020-12-29: NEWS1: Oil & Gas Stock Roundup: BP's Gas Production in India & a Flurry of Discoveries.NEWS2: Kunlun Energy Company Limited -- Moody's affirms Kunlun Energy's A2 ratings; outlook stable.
2020-12-30: nan

Answer: Decrease