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After its cancellation by CBS , The CW picked up the show for season two , leading Berlanti to promise a four-way crossover with " Supergirl " , " The Flash " , " Arrow " and " Legends of Tomorrow " .
 CBS, The CW, Berlanti
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 CBS, The CW, Berlanti