774
-DOCSTART- # Houston devastated by deadly flooding from # Harvey , more rain ahead https://t.co/gggnUbBvp6
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: exact location, area, road, river 
Text: {0} 
 Entities:  
Answer:
 None