33906
In 2011 , Noble Energy estimated that a pipeline to Leviathan gas field could be in operation as soon as 2014 or 2015 .
 Noble Energy, Leviathan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Noble Energy, Leviathan