87138
In addition , both specialized ( usually coming from the field of science ) and commonplace English words ( notably abstract , commodity / service-related or technical terms ) have also penetrated Bulgarian since the second half of the 20th century , especially since 1989 .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None