With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: William Shakespeare did not collaborate with other playwrights.
text_B: The following outline is provided as an overview of and topical guide to evolution  :. outline. Outline ( list ). Evolution -- change in heritable traits of biological organisms over generations due to natural selection , mutation , gene flow , and genetic drift .. Evolution. Evolution. biological organisms. Organisms. natural selection. natural selection. mutation. mutation. gene flow. gene flow. genetic drift. genetic drift. Also known as descent with modification .. Over time these evolutionary processes lead to formation of new species -LRB- speciation -RRB- , changes within lineages -LRB- anagenesis -RRB- , and loss of species -LRB- extinction -RRB- .. speciation. speciation. anagenesis. anagenesis. extinction. extinction. evolutionary processes. Evolution. `` Evolution '' is also another name for evolutionary biology , the subfield of biology concerned with studying evolutionary processes that produced the diversity of life on Earth .. Evolution. Evolution. evolutionary biology. evolutionary biology. biology. biology. evolutionary processes. Evolution. diversity of life. diversity of life
not_related.