1413
Early computer-generated models of planetary formation predicted the existence of terrestrial planets around both Alpha Centauri A and " B , but most recent numerical investigations have shown that the gravitational pull of the companion star renders the accretion of planets difficult .
 location: Alpha Centauri A; location: " B
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Alpha Centauri A; location: " B