60135
Alpha Andromedae and Gamma Pegasi together made " Wall " ( 壁宿 ) , representing the eastern wall of the imperial palace and / or the emperor 's personal library .
 Alpha Andromedae, Gamma Pegasi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Alpha Andromedae, Gamma Pegasi