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: what is the extension of seo? 
Knowledge Triplets: SEO Expert, people.profession.people_with_this_profession, Joel Glenn Wright
m.0j72y30, type.object.permission, m.0j72y20
Digital Marketing, type.object.permission, m.0j72y20
m.0j72y20, type.permission.controls, SEO
m.0j72y20, type.permission.controls, m.0j72y3l
m.0j72y20, type.permission.controls, All topics
Search Marketing, type.type.domain, Digital Marketing Blog
Joel Glenn Wright, people.person.profession, SEO Expert
Digital Strategy, type.object.permission, m.0j72y20
m.0j72y3v, type.object.permission, m.0j72y20
Digital Marketing, type.type.domain, Digital Marketing Blog
m.0j72y20, type.permission.controls, Search Engine Optimization
Search Engine Optimization, type.object.permission, m.0j72y20
Blogging, type.type.domain, Digital Marketing Blog
m.0j72y5d, type.object.permission, m.0j72y20
m.0j72y20, type.permission.controls, Content Curation
m.011tfyf_, type.permission.controls, SEO Expert
Digital Marketing Blog, type.object.permission, m.0j72y20
m.0j72y20, type.permission.controls, Semantic Search
All topics, type.object.permission, m.0j72y20
m.0j72y20, type.permission.controls, Digital Marketing
Blogging, type.object.permission, m.0j72y20
Topic, type.object.permission, m.0j72y20
m.03k, type.permission.controls, m.0j72y20
m.0j72y20, type.permission.controls, m.0j72y5d
m.0j72y20, type.permission.controls, Topic
m.0j72y20, type.permission.controls, SEM
m.0j72y20, type.permission.controls, Digital Marketing Blog
Content Curation, type.type.domain, Digital Marketing Blog
Digital Marketing Blog, type.domain.types, Content Curation
Search Engine Optimization, type.type.domain, Digital Marketing Blog
Joel Glenn Wright, type.domain.types, SEO Expert
m.0j72y20, type.permission.controls, Digital Strategy
m.0j72y20, type.permission.controls, Search Marketing
SEO Expert, type.type.extends, SEO consultant
SEM, type.object.permission, m.0j72y20
Content Strategy, type.type.domain, Digital Marketing Blog
SEO, type.type.domain, Digital Marketing Blog
Digital Marketing Blog, type.domain.types, Search Engine Optimization
Digital Marketing Blog, type.domain.types, Digital Strategy
Social Media, type.object.permission, m.0j72y20
Digital Marketing Blog, type.domain.types, Digital Marketing
Digital Marketing Blog, type.domain.types, Social Media
m.0j72y20, type.permission.controls, m.0j72y3v
Semantic Search, type.type.domain, Digital Marketing Blog
m.0j72y20, type.permission.controls, Content Strategy
Digital Marketing Blog, type.domain.types, SEM
Social Media, type.type.domain, Digital Marketing Blog
m.0j72y20, type.permission.controls, m.0j72y30
m.0j72y39, type.object.permission, m.0j72y20
Organic Search, type.object.permission, m.0j72y20
m.0j72y4c, type.object.permission, m.0j72y20
SEO Expert, type.object.permission, m.011tfyf_
Search Engine Marketing, type.type.domain, Digital Marketing Blog
m.0j72y20, type.permission.controls, m.0j72y5p
m.0j72y20, type.object.permission, m.03k
SEO Expert, type.type.domain, Joel Glenn Wright
SEO Expert, type.type.extends, Online Advertising
m.0j72y20, type.permission.controls, m.0j72y42
m.0j72y20, type.permission.controls, Social Media
m.0j72y20, type.permission.controls, Digital Marketing Blog Experts
m.0j72y20, type.permission.controls, Blogging
Digital Marketing Blog, type.domain.types, Blogging
Stefano Natale, people.person.profession, SEO Expert
m.0j72y42, type.object.permission, m.0j72y20
Digital Marketing Blog, type.domain.types, Organic Search
m.0j72y20, type.permission.controls, m.0j72y54
Search Marketing, type.object.permission, m.0j72y20
m.0j72y20, type.permission.controls, m.0j72y4n
Digital Marketing Blog, type.domain.owners, Owners of digitalmarketingblog domain
SEO Expert, type.type.extends, SEO
m.0j72y4x, type.object.permission, m.0j72y20
SEO Expert, type.type.extends, Marketing Specialist
m.0j72y20, type.permission.controls, m.0j72y39
Content Curation, type.object.permission, m.0j72y20
Content Strategy, type.object.permission, m.0j72y20
m.0j72y20, type.permission.controls, Owners of digitalmarketingblog domain
m.0j72y20, type.permission.controls, m.0j72y4x
Organic Search, type.type.domain, Digital Marketing Blog
SEM, type.type.domain, Digital Marketing Blog
m.0j72y20, type.permission.controls, Organic Search
SEO, type.object.permission, m.0j72y20
Digital Marketing Blog, type.domain.types, Content Strategy
Digital Marketing Blog, type.domain.types, Topic
m.0j72y3l, type.object.permission, m.0j72y20
SEO Expert, people.profession.people_with_this_profession, Stefano Natale
SEO, type.type.extends, SEO Expert
Topic, type.type.domain, Digital Marketing Blog
Digital Marketing Blog, type.domain.types, SEO
Semantic Search, type.object.permission, m.0j72y20
m.0j72y4n, type.object.permission, m.0j72y20
Digital Strategy, type.type.domain, Digital Marketing Blog
m.0j72y54, type.object.permission, m.0j72y20
Search Engine Marketing, type.object.permission, m.0j72y20
m.0j72y5p, type.object.permission, m.0j72y20
Owners of digitalmarketingblog domain, type.object.permission, m.0j72y20
Digital Marketing Blog, type.domain.types, Search Marketing
Digital Marketing Blog, type.domain.types, Search Engine Marketing
m.0j72y20, type.permission.controls, m.0j72y4c
m.0j72y20, type.permission.controls, Search Engine Marketing
Digital Marketing Blog Experts, type.object.permission, m.0j72y20
Digital Marketing Blog, type.domain.types, Semantic Search

Answer: Online Advertising
SEO consultant
Marketing Specialist