50641
Since only a small part of the oxygen , and virtually none of the inert gas is consumed , every exhaled breath from an open-circuit scuba set represents at least 95 % wasted potentially useful gas volume , which has to be replaced from the breathing gas supply .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None