user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: name the public library sytem that has tonkawa public library central library.? 
Knowledge Triplets: m.0j9ryw5, location.mailing_address.citytown, Tonkawa
Tonkawa Public Library, library.public_library_system.annual_visits, m.03z44fn
Tonkawa Public Library, library.public_library_system.central_library, Tonkawa Public Library Central Library
Tonkawa Public Library, library.public_library_system.annual_circulation, m.03z44fv
Tonkawa Public Library, library.public_library_system.nces_code, OK0092
m.0j9ryw5, location.mailing_address.postal_code, 74653
m.0j9ryw5, location.mailing_address.street_address, 216 N. Seventh
m.0j9ryw5, location.mailing_address.state_province_region, Oklahoma
Tonkawa Public Library, library.public_library_system.branches, Tonkawa Public Library Central Library
Tonkawa Public Library Central Library, library.public_library.address, m.0j9ryw5
Tonkawa Public Library Central Library, library.public_library.library_system, Tonkawa Public Library
Tonkawa Public Library, library.public_library_system.collection_size, m.03z44fg
Tonkawa Public Library Central Library, library.public_library.phone_number, m.0j9ryxj

Answer: Tonkawa Public Library