18137
At the same time , the state taxation department , in accordance with international practice and by drawing on the experiences of some of the main oil producing countries in the world , was continuously revising and improving the policies , laws and regulations on the taxation of cooperation with the outside in exploring and developing petroleum , initially framing a tax system suite for the cooperation with the outside on exploring and developing petroleum and natural gas , which exerted important roles in attracting foreign merchant 's investment .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
 Entities:  
Answer:
 None