2807
When  Arkansas  left the Union the Yell Rifles became part of the  1st Arkansas Infantry  later designated the 15th Arkansas of which he was elected Colonel .
 founded by: Arkansas, 1st Arkansas Infantry
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Arkansas, 1st Arkansas Infantry 
Answer:
 founded by: Arkansas, 1st Arkansas Infantry