1001
All vowels can also be nasalized , which is noted by appending an ' n ' letter after the base vowel , or by adding a combining tilde above the vowel ( most commonly and easily done for " a " and " o " due to the Portuguese letters ) , or more commonly by non-ambiguously appending an letter after the base vowel ( this depends on the orthographic variant ) .
 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