With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tokyo is in Asia.
text_B: Perfect phylogeny is a term used in computational phylogenetics to denote a phylogenetic tree in which all internal nodes may be labeled such that all characters evolve down the tree without homoplasy .. computational phylogenetics. computational phylogenetics. phylogenetic tree. phylogenetic tree. homoplasy. homoplasy. That is , characteristics do not hold to evolutionary convergence , and do not have analogous structures .. evolutionary convergence. convergent evolution. analogous. analogy ( biology ). Statistically , this can be represented as an ancestor having state `` 0 '' in all characteristics where 0 represents a lack of that characteristic .. Each of these characteristics changes from 0 to 1 exactly once and never reverts to state 0 .. It is rare that actual data adheres to the concept of perfect phylogeny .
not_related.