38887
These algorithms were sought long before the concept of " NP " - completeness was even defined ( Karp 's 21 " NP " - complete problems , among the first found , were all well-known existing problems at the time they were shown to be " NP " - complete ) .
 Karp
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Karp