With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: To Kill a Mockingbird was published in the twentieth century.
text_B: Perry the Platypus , also known as Agent P or simply Perry , is an anthropomorphic platypus from the animated series Phineas and Ferb .. Phineas and Ferb. Phineas and Ferb. Platypus. Platypus. anthropomorphic. anthropomorphic. platypus. platypus. animated. animated. Perry was created by the series ' co-founders , Dan Povenmire and Jeff `` Swampy '' Marsh .. Dan Povenmire. Dan Povenmire. He first appeared along with the majority of the main cast in the pilot episode `` Rollercoaster . ''. Rollercoaster. Rollercoaster ( Phineas and Ferb episode ). pilot. television pilot. Perry is featured as the star of the B-plot for every episode of the series , alongside his nemesis Dr. Heinz Doofenshmirtz .. Heinz Doofenshmirtz. Heinz Doofenshmirtz. B-plot. Subplot. Dr. Heinz Doofenshmirtz. Dr. Heinz Doofenshmirtz. A mostly silent character , his lone vocal characteristic -LRB- a rattling of Perry 's beak -RRB- was provided by Dee Bradley Baker .. Dee Bradley Baker. Dee Bradley Baker. Perry is the pet platypus of the Flynn-Fletcher family , and is perceived as mindless and domesticated .. platypus. platypus. In secret , however , he lives a double life as a member of an all-animal espionage organization referred to as O.W.C.A. -LRB- Organization Without a Cool Acronym -RRB- .. espionage. espionage. Many secret entrances to his underground lair exist all around the house ; such as the side of the house , most notably the tree that his owners sit under in the backyard , and several other everyday objects that seem to elude the family 's attention .. Perry also has entrances in Hawaii and North Dakota .. He engages in daily battles with Dr. Heinz Doofenshmirtz , an evil scientist who desires to take over the Tri-state area with obscure contraptions that work perfectly according to his intended function but fail in his application of them every time .. Heinz Doofenshmirtz. Heinz Doofenshmirtz. Dr. Heinz Doofenshmirtz. Dr. Heinz Doofenshmirtz. evil scientist. evil scientist. Tri-state area. Tri-state area. Perry was made a platypus because of the animal 's striking appearance and the lack of public knowledge of the animal , which allowed the writers to make things up about the species .. platypus. platypus. Critical reception for the character from both professionals and fans have been considerably positive .. Merchandising of the character include plush toys , t-shirts , wooden toys , glasses , and coloring books , along with appearances in literature and a 2009 video game for the Nintendo DS .. plush toys. plush toys. t-shirts. t-shirts. glasses. glasses. coloring books. coloring books. video game. Phineas and Ferb ( video game ). Nintendo DS. Nintendo DS
not_related.