15602
The purple , lowercased " " sgi " " logo can be seen at the beginning of the opening credits of the HBO series " Silicon Valley " , before being taken down and replaced by the Google logo as the intro graphics progress .
 HBO, Google
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 HBO, Google