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Starting on 9 July 2017 , there is an international mass celebrated at the basilica on every Sunday and holy day of obligation , at 9 a .
 time: holy day of obligation
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 time: holy day of obligation