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 magazine issue did carl lundgren do the cover art for? 
Knowledge Triplets: Carl Lundgren: Great Artist, book.written_work.author, Carl Lundgren
Marion Zimmer Bradley's Fantasy, Fall 1998, book.magazine_issue.magazine, Marion Zimmer Bradley's Fantasy Magazine
Carl Lundgren, book.author.works_written, Carl Lundgren: Great Artist
Carl Lundgren, people.person.gender, Male
m.0bjbg_q, award.award_nomination.award_nominee, Carl Lundgren
America Home of the Brave, film.film.subjects, United States of America
Missbehave, book.periodical.language, United States of America
Carl Lundgren, book.illustrator.magazine_covers, Isaac Asimov's Science Fiction Magazine, February 1987
Capitalism: A Love Story, film.film.subjects, United States of America
Carl Lundgren, people.person.date_of_birth, 1947-07-12
Free Live Free, book.book_edition.cover_price, m.05qt8gt
Free Live Free, book.book_edition.cover_artist, Carl Lundgren
Rick DeMarco, book.illustrator.book_editions_illustrated, Free Live Free
Carl Lundgren, award.award_nominee.award_nominations, m.0bjbg_q
9780961297015, book.isbn.book_editions, Free Live Free
The Magazine of Fantasy & Science Fiction, April 1982, book.magazine_issue.magazine, The Magazine of Fantasy & Science Fiction
Men's Vogue, book.periodical.language, United States of America
Carl Lundgren, award.award_nominee.award_nominations, m.091r799
The Magazine of Fantasy & Science Fiction, April 1982, book.magazine_issue.publication_date, m.0j122wd
The Magazine of Fantasy & Science Fiction, April 1982, book.magazine_issue.cover_artist, Carl Lundgren
Aboriginal Science Fiction, book.magazine.issues, Aboriginal SF, December 1986
The Magazine of Fantasy & Science Fiction, book.magazine.issues, The Magazine of Fantasy & Science Fiction, April 1982
Marion Zimmer Bradley's Fantasy, Fall 1998, book.magazine_issue.cover_artist, Carl Lundgren
Easy Rider, film.film.subjects, United States of America
Prozac Nation, film.film.subjects, United States of America
Asimov's Science Fiction, book.magazine.issues, Isaac Asimov's Science Fiction Magazine, February 1987
m.091r799, award.award_nomination.award_nominee, Carl Lundgren
Free Live Free, book.book.editions, Free Live Free
Free Live Free, media_common.creative_work.credit, Gene Wolfe
Isaac Asimov's Science Fiction Magazine, February 1987, book.magazine_issue.cover_artist, Carl Lundgren
Free Live Free, book.book_edition.place_of_publication, Willimantic
Isaac Asimov's Science Fiction Magazine, March 1986, book.magazine_issue.magazine, Asimov's Science Fiction
Teen Vogue, book.periodical.language, United States of America
Isaac Asimov's Science Fiction Magazine, March 1986, book.magazine_issue.cover_artist, Carl Lundgren
Isaac Asimov's Science Fiction Magazine, February 1987, book.magazine_issue.magazine, Asimov's Science Fiction
Aboriginal SF, December 1986, book.magazine_issue.magazine, Aboriginal Science Fiction
Rich Schindler, book.illustrator.book_editions_illustrated, Free Live Free
Free Live Free, media_common.cataloged_instance.isbn13, 9780961297015
Aboriginal SF, December 1986, book.magazine_issue.cover_artist, Carl Lundgren
Carl Lundgren, book.magazine_issue.cover_artist, Isaac Asimov's Science Fiction Magazine, February 1987
16, book.periodical.language, United States of America
Carl Lundgren, book.illustrator.magazine_covers, Marion Zimmer Bradley's Fantasy, Fall 1998
Savannah, Immortal City Photography Exhibit, exhibitions.exhibition.subjects, United States of America
Asimov's Science Fiction, book.magazine.issues, Isaac Asimov's Science Fiction Magazine, March 1986
II Americka, exhibitions.exhibition.subjects, United States of America
Free Live Free, book.book_edition.LCCN, 84090135
Marion Zimmer Bradley's Fantasy Magazine, book.magazine.issues, Marion Zimmer Bradley's Fantasy, Fall 1998
Carl Lundgren, book.illustrator.magazine_covers, Isaac Asimov's Science Fiction Magazine, March 1986
Free Live Free, book.book_edition.isbn, 9780961297015
Kewl Magazine, book.periodical.language, United States of America
Carl Lundgren, book.illustrator.magazine_covers, Aboriginal SF, December 1986
Free Live Free, book.book_edition.ISBN, 9780961297015
Carl Lundgren, book.illustrator.magazine_covers, The Magazine of Fantasy & Science Fiction, April 1982
Carl Lundgren, book.illustrator.book_edition_covers, Free Live Free
Carl Lundgren, people.person.nationality, United States of America

Answer: The Magazine of Fantasy & Science Fiction, April 1982
Aboriginal SF, December 1986
Isaac Asimov's Science Fiction Magazine, March 1986
Isaac Asimov's Science Fiction Magazine, February 1987
Marion Zimmer Bradley's Fantasy, Fall 1998