21163
That was to use railways as a pillar , roads as a chain , and strongholds as a lock , to carry out siege warfare in an attempt to divide the base areas behind enemy lines , ah , so as , er , to cut off their communication with one another .
 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